Tiled Map Setup: Ground tiles, ruins & automated asset processing

Features:
- Resized 4513 PNG assets to 40% for optimal Tiled performance
- Created comprehensive tileset library (grass, dirt, trees, flowers, ruins, walls)
- Generated 3 test maps: travnik_32x32, zapuscena_vas_48x48, travnik_s_objekti
- Added 9 different ruined building tilesets for TownRestorationSystem integration

 Tools Added:
- resize_assets_for_tiled.py: Batch resize all assets to 40%
- generate_tiled_map.py: Auto-generate maps with placed objects
- fix_tiled_map.py: Create proper tile-based maps

 Structure:
- Slike_za_Tiled/: 4513 resized assets ready for Tiled
- assets/tilesets/: 16 tileset definitions (.tsx files)
- assets/maps/: 3 ready-to-use Tiled maps (.tmx files)

 Documentation:
- docs/TILED_SETUP_GUIDE.md: Complete setup and usage guide

Ready for map design in Tiled Map Editor!

assets/tilesets/grass_ground.tsx

@@ -0,0 +1,4 @@
+<? xml version = "1.0" encoding = "UTF-8" ?>
+    <tileset version="1.10" tiledversion="1.11.1" name="Grass Ground" tilewidth="48" tileheight="48" tilecount="1" columns="1">
+        <image source="grass.png" width="48" height="48" />
+    </tileset>