Today after adding a new camera for testing, it became
clear that the previous assumption that pyunifiprotect
would update its bootstrap when new cameras were
added was incorrect.
Add in the capability to pass extra arguments through to rclone. These
are passed verbatim, and are set to '' by default. They can be passed
either with --rclone-args or by setting the environment variable
RCLONE_ARGS.
For example. the expectation is that the end user can use these for
setting a bandwidth limit so that rclone uploading doesn't saturate
their internet bandwidth.
Previously it used RuntimeExceptions which could also be raised from other source.
This also meant some exceptions could be passed silently which is no longer the case
The rclone pruge method needed access to self but wasnt called in such a way that it had it.
Previously it would leave empty directories once files were purged. This is no longer the case
by chaining a call to `rclone rmdirs`
