renamed Scene's getNumHits to onLeftClick for more understandable
function name
added empty scene function to handle onLeftRelease
created callback for when mouse moves
change the call to scene's onMouseMotion to use (windowHeight - y) as
parameter
created variables to keep track of change in mouse position and mouse
button pressed
somewhat working implementation of translation on left mouse click+drag
compile all .cpp files into .o and then link to binary
moving joints with IK, solver not outputting correct results yet