Revert "Slightly faster "OpenGL Scene" method" which caused image corruption when the QC scene changed dimensions

This reverts commit 89779e589852ddeb8d891c1a2db9c436178fedce.

Conflicts:
	SyphonQC/SyphonQC/SyphonServerQCPlugIn.m
Update Server example
Layer ordering matters again, restore notes explaining that
Version to 4, update README with changes