Knossos 1.2 patch notes

This is a bug fixing and improved stability patch.

• Fixed a bug that would sometimes cause a crash or freeze when dropping a clue while calculations were still in progress.
• Multiple fixes have been made to the multithreading code, resulting in improved stability.
• Fixed an issue where Knossos would crash if you dropped too many clues (>70), due to running out of texture memory. Old textures are now unloaded to make way for new ones, allowing you to drop as many clues as you want.