-improved WASM compilation scripts

-added external bindbc.sdl import for WASM
-working on demos (WIP, working simple demo with ECS and SDL2)
-small change in ecs.std

demos/simple/source/utils/texture.d

@@ -0,0 +1,49 @@
+module utils.texture;
+
+import ecs.std;
+
+import bindbc.sdl;
+import bindbc.sdl.image;
+
+import ecs_utils.math.vector;
+
+struct Texture
+{
+
+    void create()
+    {
+        data = Mallocator.make!Data;
+    }
+
+    bool load(SDL_Renderer* renderer, const char[] path)
+    {
+        char[] cpath = (cast(char*)alloca(path.length+1))[0..path.length+1];
+        //cpath[0..$-1] = path[0..$];
+        memcpy(cpath.ptr, path.ptr, path.length);
+        cpath[$-1] = 0;
+
+        SDL_Surface* surf = IMG_Load(cpath.ptr);
+        if(!surf)return false;
+
+        data.size = ivec2(surf.w,surf.h);
+
+        data.texture = SDL_CreateTextureFromSurface(renderer,surf);
+        SDL_FreeSurface(surf);
+
+        if(!data.texture)return false;
+
+        return true;
+    }
+
+    struct Data
+    {
+        ubyte[] data;
+
+        ivec2 size; 
+        uint bpp;
+
+        SDL_Texture* texture;
+    }
+
+    Data* data;
+}