Better Command Block UI

This is update changed a lot of internal stuff so I would appreciate bug reports on the GitHub page if you come across any issues. If there are none I'll work on backporting this to older MC versions.

Changes:

• Actually runs on Quilt again, not sure why that worked to begin with and why/when it stopped working...
• Finally added proper config screen and ModMenu support!
• Moved previous config stuff from tools window to new config screen, added button to go to config screen in their place
• Tools window now stays open when exiting and re-entering command blocks until you close it
• Added config options to define where line breaks are placed
• Added click-and-drag text selection
• Added better per-word erasing and cursor movement (i.e. when holding down CTRL)
• Gave scroll bars a lower size limit to prevent miniscule bars on really long commands
• Added output text box to Pi fraction selector to make its function clearer
• Added rudimentary color picker which outputs both integer and hex codes