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/assets/shaders/circle.fp

@@ -0,0 +1,64 @@
+precision mediump int;
+precision mediump float;
+precision lowp sampler2D;
+precision lowp samplerCube;
+
+
+#ifdef GLES
+    #define TEX(x,y) texture2D(x,y)
+	#if __VERSION__ >290
+		#define M_IN in mediump
+		#define L_IN in lowp
+	#else
+        #define M_IN varying mediump
+        #define L_IN varying lowp
+	#endif
+#else
+    #define TEX(x,y) texture(x,y)
+	#if __VERSION__ > 320
+        #define M_IN in
+        #define L_IN in
+	#else
+        #define M_IN varying
+        #define L_IN varying
+	#endif
+#endif
+
+M_IN vec2 pos;
+M_IN float edge;
+//flat M_IN vec2 fpos;
+
+//M_IN vec2 uv;
+//M_IN vec4 color;
+/*
+#ifdef GLES
+	#if __VERSION__ >290
+		in mediump vec2 uv;
+	#else
+		varying mediump vec2 uv;
+	#endif
+#else
+	#if __VERSION__ > 320
+		in vec2 uv;
+	#else
+		varying vec2 uv;
+	#endif
+#endif*/
+
+//layout(binding = 0)uniform sampler2D tex;
+
+//uniform sampler2D tex;
+
+//layout(location = 0) out vec4 outColor;
+
+void main() 
+{
+    float len2 = dot(pos,pos);
+    
+    if(len2 > 1.0)discard;
+    
+    if(len2 > edge)gl_FragColor = vec4(0.4,0.8,1.0,0.8);//TEX(tex,uv) * color;
+    else gl_FragColor = vec4(0,0.6,1.0,0.35);//TEX(tex,uv) * color;
+    //gl_FragColor = vec4(pos,0,1);
+	//if(gl_FragColor.a < 0.01)discard;
+}