Remove build.sh support from profiles and mkarchiso

David Rungerequested to merge
issues/51 into master

configs/{baseline,releng}/build.sh: Remove build.sh scripts. They were deprecated with v47.

archiso/mkarchiso: Remove all build.sh related functionality (i.e. command_pkglist(), command_iso(), command_prepare(), command_install(), command_init(), command_run()).

Rename command_build_profile() to _build_profile() to be more in line with the style of the other function naming.

Change _show_config() to only print info about the profile and make no more use of parameters.

Fix shellcheck for source discovery in _read_profile()

Remove all help output related to legacy build.sh commands.

Fixes #51 (closed)

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