Mod Organizer 2.5.2-ML1.5

• Updated to 2.5.2, many of the previous features in this fork are now part of mainline.
• The LOOT plugin is hidden if sorting is disabled or unsupported.
• Hid the FO4 LOOT button behind a setting, just like in FNV and TTW instances in >=2.5.2.
• Removed the automatic .override creation in FNV and TTW instances. It's better to let users handle this.
• Removed the third party explorer support due to issues in UI Base during compilation.
• Restored the removed themes.
• Fixed the Fallout 4 instance icon not using the fork's.
• Fixed the About icon.