Supplemental update to v1.5.4: move semantics, lods, stos, scas

This supplemental update to v1.5.4 features:

• more tests for move semantics; move semantics implemented for le, mod, mov, ne, psh.
• mbegin .. mend construct (implicit move semantics inside the block).
• bfstrip now doesn't strip unrecognized commands if bfmake flag -q is supplied.
• move semantics for sub, rcl and sto.
• countless manual updates.
• bfmake preserves files on failed build.
• the makefile works on Mach/BSD (thanks to @sech1p)
• optimization for mul reg, imm
• translation to and from trivial brainfuck substitutions (subst.pl)
• lods, stos, scas (check the manual/discord server for more).
• a full make target to build, install and test asm2bf.
• change the apperiance of hello-fancy.asm in the examples directory.
• alias _ to print in lib-bfm
• x64 Darwin binaries (@sech1p)