bin: Consolidate build recipes for similar programs
tests: Sort build recipes for tests after test helpers
If we don't do this, we won't be able to give the tests proper dependencies on the helper programs that they use.
build: Make tests depend on all built targets
This allows doing:
meson setup _build meson test -C _build
without an intervening
meson compilestep. Previously, this would have failed because the tests require various helpers and fixtures, while some of the code under test also requires helper programs, and some of the code under test is a CLI program.
For a project this small, there's no real need to distinguish precisely which programs are needed by which test: we can just assume that all tests need all programs, like Autotools would.
Best reviewed a commit at a time.