Zcam

I revived ZCAM on a whim.   I cleaned up the zcam code and made any changes to the original codebase dependant on "#ifdef __ZCAM__".   This can be enabled by adding "USE_ZCAM=1" into Makefile.local.
USE_ZCAM defaults to 0
I am not sure why code/tools/lcc/lburg/gram.c changed but it has to be during the build phase.   Those changes are not part of zcam or my doing and should be ignored.