remove `zig build --init`. add `zig init-lib` and `zig init-exe`

init-lib creates a working static library with tests, and
init-exe creates a working hello world with a `run` target.

both now have test coverage with the new "cli tests" file.

closes #1035
4c6f1e614aAndrew Kelley committed on 9/17/2018, 9:11:18 PMparent9c9eefc
15 files changedLine totals unavailable