Change applyMapSettings to do nothing when map_settings module is disabled
Note: The [modules/plugins]::get_map_setting method can still be used to get map specific (or default) settings values - for example, the donations time limit in the donations module.
Arguably this should be changed to always return the default values when map_settings is disabled - but since bot owners could simply customise mapsettings.xml to achieve the same effect I'll leave this as-is for now.
Fixes #16 (closed)