Huge demos update

-moved C stdlib function definitions to ecs_utils.utils
-added function to calculate mix(linear interpolation) and rsqrt(fast inverse sqrt)
-added some math to vec2 (length, normalize...)
-improved renderer with possibility to use multiple materials (one per block, not perfect solution for parallel compute, but works with some requirements)
-added blending support for material (opaque, additive, mixed)
-added Android support
-added gprahical representation for mouse tools (tool_circle.d)
-added initial support for editing template components variables
-better Component and Templates listing
-added possibility to add/removes components using mouse
-move CLocation to game_core.basic and reuse in every test
-moved tools code from demos to App (now code is fully separated from demos!)
-some improvement and fixes in Snake demo, with additional systems to handle adding and removing entities
-added new demo: Particles. By now demo has several particles to spawn and support for attractors and vortexes (calculation is made as every attractor with every entity)
-fixed bug with window hover and tools
-improved tool behaviour
-added new material
-now window is always opened as maximized windowed mode
-some minor fixes and improvements

demos/source/gui/tool_circle.d

@@ -0,0 +1,52 @@
+module gui.tool_circle;
+
+import ecs_utils.gfx.buffer;
+import ecs_utils.gfx.shader;
+import ecs_utils.gfx.config;
+import ecs_utils.gfx.renderer;
+
+import ecs_utils.math.vector;
+
+version(WebAssembly)import glad.gl.gles2;
+else version(Android)import glad.gl.gles2;
+else import glad.gl.gl;
+
+struct ToolCircle
+{
+    //Buffer vbo;
+    //Buffer ibo;
+
+    uint material_id = 1;
+    uint mesh_id = 0;
+
+    /*/void generate()
+    {
+        ushort[]
+    }*/
+
+    void draw(Renderer* renderer, vec2 position, float size, float edge = 1)
+    {
+        position = position * renderer.view_size + renderer.view_pos;
+        vec2 sizes = renderer.view_size * size;
+        vec2 sizes2 = vec2(edge,0);
+
+        import core.stdc.string;
+        ubyte[32] uniform_block;
+        void* ptr = uniform_block.ptr;
+        *cast(float*)(ptr) = sizes.x;
+        *cast(float*)(ptr+4) = 0;
+        *cast(float*)(ptr+8) = 0;
+        *cast(float*)(ptr+12) = sizes.y;
+        memcpy(ptr+16,position.data.ptr,8);
+        memcpy(ptr+24,sizes2.data.ptr,8);
+        glEnableVertexAttribArray(0);
+
+        GfxConfig.meshes[mesh_id].bind();
+        GfxConfig.materials[material_id].bind();
+        GfxConfig.materials[material_id].pushBindings();
+        GfxConfig.materials[material_id].pushUniforms(uniform_block.ptr);
+        //glDisable(GL_DEPTH_TEST);
+
+        glDrawElements(GL_TRIANGLES,6,GL_UNSIGNED_SHORT,null);
+    }
+}