[[ Foundation ]] Added one, zero, minus one number constants.
[[ Foundation ]] Added mutability operations to custom value types.
[[ Foundation ]] Fixed bug in interring.
[[ Foundation ]] Fixed bug in array creation from object list.

Conflicts:
	libfoundation/include/foundation.h
	libfoundation/src/foundation-core.cpp
	libfoundation/src/foundation-private.h
	libfoundation/src/foundation-value.cpp