chore(core): use builder_ for build.sh

Refactoring of build.sh to use the builder_ functions. The script should
now be a lot cleaner. Usage is available with `core/build.sh --help`

Targets are :x86, :x64, :wasm, :arch (linux/mac).

Supports additional requirements of Linux build (--target-path,
--configure).

By default will attempt to build all available targets.

Actions are: clean, configure, build, test, install, uninstall.

The install and uninstall actions only work for linux and mac targets at
present.