Things to do

Add basic bindings for important allegro modules.

[X] Display
[X] Events
[-] Filesystem - better to use Guile
[ ] Fullscreen modes
[X] Graphics
[ ] Joystick
[X] Keyboard
[X] Monitor
[X] Mouse
[ ] Path - better to use Guile
[ ] State
[X] System
[X] Time
[X] Timer
[X] Transformations
[ ] Miscellaneous
[-] Platform-specific - Don’t see a point in wrapping these.
[ ] Audio addon
[ ] Audio codecs
[ ] Color addon
[ ] Font addons
[X] Image I/O addon
[ ] Primitives addon

Add additional logic to asset loading procedures

When an asset (bitmap, font, etc.) fails to load, return #f instead of an wrapped null pointer.