600D stubs and more

Created originally on Bitbucket by escho

Was already merged in Bitbucket before import, marked as merged by the import user

-add missing stubs for 600D (got some nice help to confirm my findings, thank you)

-disabled some more things in the debug menue. Without disabling, the cam do not boot, because mem-siz (autoexec.bin) is over 0x8somewhat and so too big

Should be ready for testing.