Provide static versions of default REPR sub-vtables
Add missing const to MVM_string_ascii_decode*()
Hack-in char* REPR names

There appear to be no new failures in selftest
some name renaming
make HashAttrStore this_repr static
make some reprs this_repr static
make some reprs this_repr static
make some reprs this_repr static
make HashAttrStore this_repr static
make some reprs this_repr static
make some reprs this_repr static
make some reprs this_repr static
Use default values to initialize REPR sub-vtables
Merge branch 'fixme' into static-repr

This reverts 6a46815e7ccd7 which broke selftest by
making the GC unhappy.

Conflicts:
	src/6model/reprs/KnowHOWAttributeREPR.c
	src/6model/reprs/KnowHOWREPR.c
	src/6model/reprs/Lexotic.c
	src/6model/reprs/MVMArray.c
	src/6model/reprs/MVMCFunction.c
	src/6model/reprs/MVMCallCapture.c
	src/6model/reprs/MVMCode.c
	src/6model/reprs/MVMCompUnit.c
	src/6model/reprs/MVMContext.c
	src/6model/reprs/MVMException.c
	src/6model/reprs/MVMHash.c
	src/6model/reprs/MVMIter.c
	src/6model/reprs/MVMOSHandle.c
make the left reprs this_repr static
fixed copy-pasto
added MVM_REPR_DEFAULT_FUNCS
Add REPR IDs to static REPR struct
avoids some MVMROOT
Add back a missing MVMROOT