OBS Lua Dropped Frame Alarm 2.1.0

Found an OS detect function, so the necessary change is now automatic.

- Add Rendering and Encoding lagged frames.
- This may require a small edit to the script on OS X
- Add separate alarm levels for each type of failed frame.
- Add new graph layers for other frame types
- Add settable color properties to graph scource.
- Add setting for alarm repeat rate.
- Removed `dump_obs` debugging function and other unused code.
- Ran through LuaCheck linter