**Increments Plugin API Version**
Adds functions:
- `obs_websocket_get_api_version()` - Gets the current obs-websocket
plugin API version
- `obs_websocket_call_request()` - Calls an obs-websocket request via
the plugin API
Adds structs:
- `obs_websocket_request_response`
- Implements a WIP ObsWebSocketApi, for obs-websocket-api.h. Events are
finished, but requests are not.
- Some logging improvements
- A bit of code cleanup around the plugin
This header file is meant to be included by 3rd party OBS plugins,
which allows them to add custom requests and events to obs-websocket.
*not finished yet*