Fix inconsistent verbose output
Introduce experimental make/msbuild replacement

To drive the testing (and building) framework towards union across the
supported platforms/toolchains, here’s a new make-like program.

The syntax is inspired by msbuild’s project file syntax, while the way it
works is more make-like.

Initial features include: multiple targets per makefile (.abcmk),
parallel build (for now fixed at 8 concurrent jobs).
Initial argument parsing for make.py