Common update:

-added multiple new function to allocate template and add entity
-updated README.md (complete initial version)
-empty components now don't take memory
-fixedd small bug with TestRunner
-added many new tests (HashMap, Vector, EntityMeta, ...)
-added default hashing function to HashMap
-fixed critical bug with adding entities
-fixed small bug with adding entity with remplacement components
-added asserts into code to better bug detection
-small performance improvement for events
-added ComponentRef structure which contain data pointer and componentID
-remove EntityID from Event structure
-now events are handled before removing entiteis
-fixed GDC compilation
-fixed rendering of rotated sprites
-added weapons as separate entities to space ship and others
-added Tower enemy to SpaceInvaders demo
-added Boss to SpaceInvaders demo (boss has four tower attached to it)
-Boss towers shoot multiple bullets upon death
-fixed critical bug with demos switching
-fixed critical bug related to adding/removing entities form inside onAdd/onRemove entity callback
-added animation support
-added particles sypport and particles for firing and explostions, and more
-multithreaded rendering now has same rendering order as singlethreaded
-application automaticallu detect host CPU threads count
-added upgrades to SPaceInvaders demo
-fixed texture memory freeing
-improved documentation
-improved multithreaded performance
-improve shader code
-fixed registration issue
-some additional performance improvements
-added depth and colors to rendering parameters
-jobs now has names corresponding to their systems
-change execute() -> willExecute()
-added EntityMeta structure to speedup getting fetching components form entity
-improved multithreading rendering
-added possibility tio change number of threads runtime
-added bullets collision detection in SpaceInvaders demo
-some CI changes
-added VBO batch rendering (current default, no render mode switch yet)
-fixed camera positioning calculation
-fixed buffer issue with WebGL
-added viewport scalling (at least 300 pixels height). Pixels are scalled if screen is bigger.
-center demos gameplay area
-added fullpage html template for Emscripten build
-added many new sprites to atlas
-fixed critical bug with CPU usage in multithreaded mode
-snake render tile coresponding to body part
-snake is destroyed after collision and emit some particles
-added some functionality to vectors
-fixed documentation issue in Manager.d
-more minor code changes and cleanup

source/bubel/ecs/core.d

@@ -0,0 +1,115 @@
+/************************************************************************************************************************
+This module contain main templates for user.
+There are three structure templates (mixins) which should be added on top of structure:
+$(LIST
+	* System: make system structure
+	* Component: make component structure
+	* Event: make event structure
+)
+
+---
+Struct System1
+{
+	mixin!ECS.System;
+}
+
+Struct System2
+{
+	mixin!ECS.System(16);//set number of jobs generated for system by multithreaded update
+}
+
+Struct Component1
+{
+	mixin!ECS.Component;
+}
+
+Struct Event1
+{
+	mixin!ECS.Event;
+}
+---
+
+There is also template for generating list of excluded components "ExcludedComponets(T...)".
+This template takes component structure types and making list of excluded components used in "registerSystem" function.
+
+---
+Struct System1
+{
+	mixin!ECS.System;
+
+	struct EntitiesData
+	{
+		... //used components
+	}
+
+	ExcludedComponets!(Comp1, Comp2);
+}
+---
+
+Copyright: Copyright © 2018-2019, Dawid Masiukiewicz, Michał Masiukiewicz
+License: BSD 3-clause, see LICENSE file in project root folder.
+*/
+module bubel.ecs.core;
+
+public import bubel.ecs.manager;
+public import bubel.ecs.entity;
+
+/************************************************************************************************************************
+Main struct used as namespace for templates.
+*/
+static struct ECS
+{
+	/************************************************************************************************************************
+	Mark structure as System. Should be added on top of structure (before any data).
+	*/
+	mixin template System(uint jobs_count = 32)
+	{
+		__gshared ushort system_id = ushort.max;
+		uint __ecs_jobs_count = jobs_count;
+	}
+
+	/************************************************************************************************************************
+	Mark structure as Component. Should be added on top of structure (before any data).
+	*/
+	mixin template Component()
+	{
+		__gshared ushort component_id = ushort.max;
+
+		ComponentRef ref_() @nogc nothrow return 
+		{
+			return ComponentRef(&this, component_id);
+		}
+	}
+
+	/************************************************************************************************************************
+	Mark structure as Event. Should be added on top of structure (before any data).
+	*/
+	mixin template Event()
+	{
+		__gshared ushort event_id = ushort.max;
+	}
+
+	/************************************************************************************************************************
+	Make list of excluded components. This template get structure types as argument. Should be added inside System structure.
+	*/
+	mixin template ExcludedComponents(T...)
+	{
+		alias ExcludedComponents = T;
+	}
+
+	/************************************************************************************************************************
+	Make list of readonly ependencies. This template get strings as arguments. Should be added inside System structure.
+	*/
+	mixin template ReadOnlyDependencies(T...)
+	{
+		alias ReadOnlyDependencies = T;
+	}
+
+	/************************************************************************************************************************
+	Make list of writable ependencies. This template get strings as arguments. Should be added inside System structure.
+	*/
+	mixin template WritableDependencies(T...)
+	{
+		alias WritableDependencies = T;
+	}
+}