feat(entities): andamiatge del sistema d'entitats (classes, factory, bus, YAML, placeholders, smoke tests)

data/entities/wall_trap/wall_trap.yaml

@@ -0,0 +1,17 @@
+name: wall_trap
+type: static_hazard
+sprite:
+  path: wall_trap.gif
+  size: [16, 16]
+tile_size: [1, 1]
+flags:
+  collides: false
+  interactable: false
+animations:
+  inactive: { frames: [0], fps: 1, loop: true }
+  active:   { frames: [0], fps: 6, loop: true }
+cycle:
+  active_duration: 0.5
+  inactive_duration: 1.5
+stats:
+  damage: 1