v2.0b2

Bug fixes:

• Fixed a graphics bug caused by returning an erroneous value from DENISEID (#676, #675)
• Several smaller GUI tweaks

Enhancements:

• Added support for the debug board implemented by @mras0 (#666)
• Improved HDF geometry prediction (#674)
• A new write-through mode makes hard drives persistent (#670)
• Added several new debugging features
  • Catchpoints (stops emulation on CPU exceptions) (#666)
  • Software traps (#666)
  • Copper breakpoints and Copper watchpoints (#668)
  • Rudimentary callstack recording (#671)