When using `install`, CMake will fix up a binary's rpath entries
automatically. As `install` is also used to copy all build artifacts
into a common runtime directory, this will lead to independent binaries
such as "obs-ffmpeg-mux" to be fixed up to run within a fully portable
app bundle.
Yet during development, the app bundle is not fully portable, so rpath
entries to e.g. libobs need to be retained. Using CMake's
`install PROGRAMS` variant will achieve just that.
Status output related to OBS configuration is prefixed with the string
"OBS" and added padding for enabled and disabled features. This padding
was not aligned between platforms.
By moving the padding and prefix decoration into its own function,
both elements are controlled in a single place. CMake scripts were
changed to use this new function `obs_status` instead of using CMake's
`message` function directly.
Windows and Linux do not require a contained application bundle to run
and debug OBS - as such targets can and should be copied independently
from the main OBS application target.
Also silences the output of the `install` step that sets up those files.
