Version 1.2.1: Menu buttons + borderless toggle

Small patch with a few minor features and improvements. The main menu looks a bit better now, and those that prefer "standard" fullscreen rather than borderless windowed mode now have a toggle.

• Improved main menu button graphics
• Added toggle for Borderless fullscreen mode
• Star costs to upgrade HP/MP/Skills now max at 99
• Highlights now darken briefly when clicking, for improved feedback
• 'End Turn' (default: Start) now points controller pointer at 'Done' when shopping or looting in dialog
• Fixed 'explore channel' goal not being completed if all enemies are killed without entering combat
• Added extra info tracking for rare Cleever salvage station crash
• (Modding) added 'placeActorFromBoardedShip' task