CI and common update:

-added webpage deploymnet stage
-added separate build stage which build all binaries and generate documentation
-added Emscripten build stage for merge to master only
-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

source/ecs/system.d

@@ -1,5 +1,8 @@
 /************************************************************************************************************************
-*System module.
+System module.
+
+Copyright: Copyright © 2018-2019, Dawid Masiukiewicz, Michał Masiukiewicz
+License: BSD 3-clause, see LICENSE file in project root folder.
 */
 module ecs.system;
 
@@ -7,25 +10,27 @@ import ecs.entity;
 import ecs.manager;
 
 /************************************************************************************************************************
-*System contain data required to proper glue EntityManager with Systems.
-*System callbacks:
-*<br/>-void onUpdate(EntitesData);
-*<br/>-void onEnable()
-*<br/>-void onDisable();
-*<br/>-bool onBegin();
-*<br/>-void onEnd();
-*<br/>-void onCreate()
-*<br/>-void onDestroy();
-*<br/>-void onAddEntity(EntitesData);
-*<br/>-void onRemoveEntity(EntitiesData);
-*<br/>-void onChangeEntity(EntitiesData);
-*<br/>-void handleEvent(Entity*, Event);
+System contain data required to proper glue EntityManager with Systems.
+System callbacks:
+$(LIST
+    * void onUpdate(EntitesData);
+    * void onEnable()
+    * void onDisable();
+    * bool onBegin();
+    * void onEnd();
+    * void onCreate()
+    * void onDestroy();
+    * void onAddEntity(EntitesData);
+    * void onRemoveEntity(EntitiesData);
+    * void onChangeEntity(EntitiesData);
+    * void handleEvent(Entity*, Event);
+)
 */
 struct System
 {
 
     /************************************************************************************************************************
-    *Check if system is enabled.
+    Check if system is enabled.
     */
     export bool enabled() nothrow @nogc
     {
@@ -33,7 +38,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Enable system. If actually it is enabled function do nothing.
+    Enable system. If actually it is enabled function do nothing.
     */
     export void enable() nothrow @nogc
     {
@@ -43,7 +48,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Disable system. If actually it is disabled function do nothing.
+    Disable system. If actually it is disabled function do nothing.
     */
     export void disable() nothrow @nogc
     {
@@ -53,7 +58,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Get system priority.
+    Get system priority.
     */
     export int priority() nothrow @nogc
     {
@@ -61,7 +66,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Get system priority.
+    Get system priority.
     */
     export bool execute() nothrow @nogc
     {
@@ -69,7 +74,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Get system priority.
+    Get system priority.
     */
     export ushort id() nothrow @nogc
     {
@@ -77,7 +82,7 @@ struct System
     }
 
     /************************************************************************************************************************
-    *Get system name.
+    Get system name.
     */
     export const(char)[] name() nothrow @nogc
     {