added local work-in-progress folder to .gitignore
removes extra whitespace
adds and uses MILLION and BILLION constants for time conversions
adds maximum ticks-per-second capabilitiy
adds debug/optimize conditional to makefile
makes 250fps max window refresh rate
fixes out-of-bounds drawing bug in fill_circle
adds and uses timespec comparision utility function
turns off debugging mode in makefile
adds ticks-per-second debug reporting