Fixed a critical regression causing the add-on to not initialize.

Feature:
- added option to copy over emote associations between seasonal groups
- added option to create seasonal emote associations from BTTV emote sets

Bugfixes:
- fixed emote usages not showing correctly in BTTV dashboards and FFZ channel pages
- fixed page blanking when switching between dashboards (BTTV)

Other:
- added error toast for some possible errors

SEASONAL EMOTES:
- automated switching between non-seasonal and seasonal emote sets
- add seasonal alternative / add emote as seasonal directly from an emotes page
- works on both BTTV and FFZ

OTHER FEATURES
- added an optional performance improvement tweak for betterttv.com

BUGFIXES / CHANGES:
- using non-cached emotes from BTTV to show changes in emote duplicates instantly
- fixed a bug during login
- fixed a bug when displaying long names in emote cards
- fixed some layout issues
- fixed bugs with attaching / detaching Tools for BTTV on betterttv.com
- using custom HTML instead of chart.js for usage chart
- rewrite of internal channel / user info management
- added hook into fetch to drastically reduce (doublet) network requests