-added check-true and check-non-zero
using sdl-true-p in the functions that check is a joystick or mouse is haptic
- initial check-in of timer.lisp
Merge remote-tracking branch 'origin/master'
- fixed a missing arg in the call to sdl-remove-timer
- updated mouse.lisp
- renamed joystick-opened to joystick-opened-p
- added some comments
- rounded out the basic haptic support
- added the timer to the file list in sdl2.asd
- removed the spurious print statements in basic-test
- updated package.lisp, organizing exported symbols by the file they're located in. Also added comments denoting which file.