rewrite: Initial rewrite skeleton.

Remove modules that will no longer be required.
Move pending modules to pending-rewrite folders.

bot/modules/pending-rewrite/workout/data.py

@@ -0,0 +1,10 @@
+from data import Table, RowTable
+
+
+workout_channels = Table('workout_channels')
+
+workout_sessions = RowTable(
+    'workout_sessions',
+    ('sessionid', 'guildid', 'userid', 'start_time', 'duration', 'channelid'),
+    'sessionid'
+)