feat: graduate can select from multiple project directories

[Soleone]

• Allow configuring multiple parent directories to which tries can be graduated to
  • Backwards compatbile with old TRY_PROJECTS format
  • Now supports a colon separated list
• Select with up and down arrow keys
• New: Use left and right arrow keys to move cursor and type in a custom parent directory
• Polished graduation screen for better visual clarity (at the cost of some more code)
  • Bold for part of the path that is different across the list, to stand out
  • Shorten /home/username to just ~

After:

Before:

(Can't move the cursor, can only move destructively)