Haiku OS port TODO

[rollerozxa]

An initial Haiku OS port exists in the haiku-port branch. It is mostly functional, but here are some things that are yet to be done with it:

• URL handler
• Ability to send commands to an already running instance of Principia (for playing community levels, see how the Linux backend does it with Unix pipes)
• Fix crash when quickadd dialog is closed
• Packaging for inclusion in Haiku's repositories

Not everything needs to be fixed before it can be merged into master. I just initially put my porting work into a separate branch for safekeeping without disturbing the master branch.