This commit reorganizes the game's source code into multiple files within a `js/` directory, creating a more modular and maintainable structure. The changes include:
- Created separate files for different game components:
- `constants.js`: Game constants and element types
- `world.js`: World management functions
- `terrain.js`: Terrain generation logic
- `physics.js`: Physics simulation
- `render.js`: Rendering functions
- `input.js`: Input handling
- `main.js`: Main game initialization and loop
- Element-specific files in `js/elements/`:
- `basic.js`: Sand, water, dirt behaviors
- `plants.js`: Grass, seeds, flowers
- `trees.js`: Tree growth and leaf generation
- `fire.js`: Fire and lava behaviors
- Updated `index.html` to load modules in the correct order
- Removed the monolithic `script.js`
The modular approach improves code readability, makes future extensions easier, and separates concerns more effectively.
