Rapptz d9e54d7dd3 [commands] Redesign extension exception flow.
Instead of raising a whole variety of exceptions, they are now wrapped
into ExtensionError derived classes.

* ExtensionAlreadyLoaded
	* Raised when an extension is already loaded in Bot.load_extension
* ExtensionNotLoaded
	* Raised when an extension is not loaded, e.g. Bot.unload_extension
* NoEntryPointError
	* Raised when an extension does not have a `setup` function.
* ExtensionFailed
	* Raised when an extension's `setup` function fails.
* ExtensionNotFound
	* Raised when an extension's module import fails.
2019-03-19 09:23:11 -04:00
..