must pass elapsed time by reference
cleaned up event manager
Merge branch 'tune-framerate' into development
added framerate counter
fixed tests to use references instead of values
Merge branch 'fix-timer-tests' into development
Merge branch 'development' into add-diagnostics
implemented frame counter
Merge branch 'add-diagnostics' into development
short and long frame ratios now return doubles
Merge branch 'fix-framecounter' into development