Expanded database testing

- Tested Submission.count descriptor
- Tested Submission.clear_other_votes
- Expanded Submission.advance testing to include exceptions, Submission
.active, Submission.completed and Submission.voting
- Changed db model __repr__ implementations to use f-strings
- Fixed Submission.update force kwarg not implemented.
- Small formatting changes, new TODO, noinspection on protected access
- Votes setter now removes duplicate keys (maintains order)
- Removed 'aiosqlite' from Pipfile general package requirements

bot/cogs/contest_commands.py

@@ -13,6 +13,7 @@ logger.setLevel(constants.LOGGING_LEVEL)
 
 
 # TODO: Add command error handling to all commands
+# TODO: Modify channel subject based on state
 
 class ContestCommandsCog(commands.Cog, name='Contest'):
     """
@@ -39,6 +40,7 @@ class ContestCommandsCog(commands.Cog, name='Contest'):
 
         # This prevents any cogs with an overwritten cog_command_error being handled here.
         cog = ctx.cog
+        # noinspection PyProtectedMember
         if cog and cog._get_overridden_method(cog.cog_command_error) is not None:
             return