-changes in EntityAlocator

* renamed to BlockAllocator
 * now it's template with compile time assingable block_size and block_in_allocation variables
-WIP Event management
 * probably working sendSelfEvent()
 * registerEvent()
-added win_dll.d as Windows DLL require functionality

source/ecs/block_allocator.d

@@ -0,0 +1,40 @@
+module ecs.block_allocator;
+
+import ecs.manager;
+
+import std.experimental.allocator;
+import std.experimental.allocator.mallocator : AlignedMallocator, Mallocator;
+
+struct BlockAllocator(uint block_size, uint blocks_in_allocation)
+{
+    void* next_block;
+
+    void* getBlock()
+    {
+        if (next_block is null)
+            allocBlock();
+        void* ret = next_block;
+        next_block = *cast(void**) next_block;
+        return ret;
+    }
+
+    void freeBlock(void* block)
+    {
+        *cast(void**)block = next_block;
+        next_block = block;
+    }
+
+    private void allocBlock()
+    {
+        next_block = cast(void*) AlignedMallocator.instance.alignedAllocate(
+                block_size * blocks_in_allocation, block_size);
+        foreach (i; 0 .. blocks_in_allocation - 1)
+        {
+            void** pointer = cast(void**)(next_block + i * block_size);
+            *pointer = next_block + (i + 1) * block_size;
+        }
+        void** pointer = cast(void**)(
+                next_block + (blocks_in_allocation - 1) * block_size);
+        *pointer = null;
+    }
+}