Harmony 2.0 RC 2

Update with feedback from rc1.

-- DO NOT MIX THIS WITH OLDER HARMONY 1 VERSIONS --

The documentation can be found at https://harmony.pardeike.net and for the changes have a look at the commit history. I am working on a proper change list. Some API changes have been made so don't expect this to go without at least some renaming/refactoring. Shouldn't be hard though.

For bugs or suggestions, feel free to file Issues or join the discord.