Show building in status bar, show build panel follows preference

Show the building process in the status bar. Depends on Show_build_status parameter, set in LatexTools settings.

Can now disable automatic popup of build results, based on the parameter set in global settings or LatexTools settings. Combines well with forked BuildOnSave, allowing for hidden build panel, appearing only when errors are present during the building process.

(cleaned indentation as well)