Parsing and support for meta-contracts and contracts #624

Job	Run time
ghidra-script-tests (22.04)	16m 54s
llvm-build-and-test (20, 22.04, Debug, OFF)	17m 59s
llvm-build-and-test (20, 22.04, Release, OFF)	17m 55s
	52m 48s

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