Refactor PlaybackSerialiser

[ScribbleTAS]

Part 3 of my ongoing quest to refactor the mod.

While the first PR (#179) was hooking into the vanilla code,
the second PR (#200) was about storing the inputs and metadata in RAM.

In this PR I will tackle the task of storing all the inputs we recorded to the file.

Current

The current system is (as always) a hardcoded mess of stuff somewhat randomly put together...
Now with a bit more experience under my belt, I should be able to upgrade whatever I wrote 3 years ago...

TODO

CustomSerialisers

• [ ] Create a serialiser registry, so it's easy to create your own TASfile Syntax
• [ ] Create a base class that all serialisers need to extend from
• [ ] Convert the old serialiser to the new format
• [ ] Create new serialiser that supports the new VirtualInputFormat
  • [ ] #183
  • [ ] #184

PlaybackExtensions

• [ ] Add PlaybackExtensionRegistry
• [ ] Convert DesyncMonitor to extension
• [ ] Convert ControlBytes to extension