Templates, Crazy perf benefits & more!

+ Added Custom User Templates!
+ Added Cryptee Templates!
+ Added a special sync function / step for templates
+ A brand new and shiny new doc popup with templates
+ Stupid-fast instant new document creation for both regular docs and templated docs
+ Added new promo banner!
+ Added a preference to make all new docs online-first.
+ STUPID FAST doc loading speeds. Esp when changing between two offline docs.
+ You can now download active doc as UECD
+ Added a custom meta tag for tables. This will allow us to ship so many cool new features. coming soon.
+ Added paper margin data to infobox
+ Added two shorter than ‘single’ line-heights

+ Changed how we display upgrade prompts for gifted users. (note to curious github readers, this is TBD, we'll talk about this later, it's for future compat)
+ We now save paper stock of a doc using the same setDocMeta function to save roundtrip traffic time, cuts down doc creation and save time by 1/3rds for paper-layout docs.
+ both ECD and UECD now carry paper format + font data
+ Changed font behavior. If user has selection = change selection font only. If user has no selection = change doc font.

+ We no longer listen to the editor's "text-change" events while "loadingDoc" is true. None of us on the team can think of any scenario where this could break anything. But if we ever experience any weird edge cases, this may be the culprit.
+ All new docs are offline-first. Fixes #191
+ We now use Inter as our default new doc font for users who don't have a new doc font preference. This is an i18n decision to support more languages and locales.

i.e. fixes the notorious internally tracked CRYPTEE-B2C error. despite what name might suggest, it has nothing to do with business-to-consumer lol.