Unity event functions should be private by default

Event functions (Awake etc.) should be not public by default as they are invoked by Unity and there is very little reason to invoke them yourselves.

An inspection and quick fix should be created to let the user know and easily fix this.

No files, tests, or entry points are named. Start by locating existing Unity inspections and quick fixes, then identify how Unity event functions such as Awake are recognized. Done means an inspection flags public event functions and a quick fix makes them private.

Written by the indexing model from the issue text.