Add Harmony support

Draft

Main changes:

• Pass the version object to the host instead of a path
• Refactor standalone "open" mode
• Add standalone "new" mode

Minimal feature:

https://docs.toonboom.com/help/harmony-24/scripting/pythonmodule/class_harmony_module.html

• Hosted:
  • Save as
  • Open
  • New
  • Save
  • Save up
• Standalone:
  • Open
  • New

Bip Host needs:

• host.save_file(version)
• host.save_file()
• host.new_file()
• host.path
• host.is_modified
• host.file_extension*
• host.open_file(version, force, mode)
• call_dialog(sdk.Host.SAVE_AS_DIALOG)