Fasttracker II clone v1.83

• In this version I have addressed some annoyances users have mentioned:
  1. Now you cannot edit pattern notes/data while the pattern editor is not visible. This further prevents accidental song edits.
  2. While in extended pattern editor mode, show a status bar with global volume, pattern edit status (to see if you are editing), and time elapsed
  3. It was not possible to issue a Note Insert (Insert key) or Line Insert (Shift+Insert) on some keyboards. Added extra keybindings:
     Ctrl+Return = Insert Note (same as Insert)
     Ctrl+Shift+Return = Insert Line (same as Shift+Insert)
• Updated the Keybindings help text to reflect the extra keybindings
• Windows/macOS: Updated SDL to v2.30.3