A bunch of stuff (see description)

- Updated Remote2D (unreleased version)
- Added health / death to enemies
- Bullets now remove themselves from the entitylist when they hit an
enemy
- Added enemy knockback, fixed issues with monster tinting (monsters are
only red when hit now)
- Work on enemy AI
- The test map is now 40x40 instead of 100x100
- The walls around the map now use the different designs in the art file
- Added Title