Colored connection logic is now contained in the cable code. We need to expand it so it will also work for the additional colored variants introduced in #320.

New rules:

• Cable-like parts only connect to:
  • Same colored parts/blocks
  • Default colored parts/blocks
  • Parts/blocks without color
• Full blocks with color connect to:
  • Any colored parts/blocks
  • Parts/blocks without color
• Full blocks without color connect to:
  • Any colored parts/blocks
  • Parts/blocks without color