[CM] New home for Grace

[Taube, Heinrich K]

I’ve changed Grace.jucer to use realtive pathnames so if you do a git pull you should get new build systems that you can try out (I wont have access to linux or windows until sunday to test.). As it stands the grace project expects a parent directory that contains juce, sndlb and grace as described in the readme.  But if you don't like that you can change Grace.jucer in the Projucer to fit your needs, that's why its included.