Added - PNG/JPG loading

The project is now set up to load png or jpg files with IMG_Load()
- Removed the .bmp files and replaced them with .png files
- Also needed to update the PATH environment variable because I'm
working from the laptop... for some reason it wasn't set along with
everything else. So some VS files are also updated.
Performance - Don't update empty tiles

Small modification that increases performance by not updating tiles
flagged as empty. Also decreased the width of the map's columns.
- Runs at about 25-40 fps on laptop