Entities are now constructable

Added utility function to display error window
Added textures
Added font
Added a way to choose resources location

README.md

@@ -13,11 +13,11 @@ This game is aimed to be a puzzle game in which the player sets different laws f
 
  - [ ] Level
   - [x] Structure
-  - [ ] Parsing from XML
+  - [x] Parsing from XML
   - [ ] A*
  - [ ] Entities
   - [x] Structure
-  - [ ] Parsing from XML
+  - [x] Parsing from XML
   - [ ] Moving
   - [ ] Decorators (Rules)
  - [ ] Rules
@@ -25,7 +25,7 @@ This game is aimed to be a puzzle game in which the player sets different laws f
   - [ ] Interaction with entities
   - [ ] Parsing of rules and creation of subsequent decorators
  - [ ] Graphics
-  - [ ] Scene rendering
+  - [x] Scene rendering
   - [ ] UI
   - [ ] Menu ?
  - [ ] Gameloop