* upgrade to AndroidX, upgrade libraries
* move to MaterialComponents theme
* make sure the compose button looks good everywhere
* fix tollbar title/button alignment on tablet
* move to new material color theming, consolidate colors and themes
* fix build, fix imports
* set error on TextInputLayout instead of EditText
* fix imports, TootButton when
* improve snackbar style
* fix task description color
* Enforce 420-character limit on media descriptions in the UI
* Persist media descriptions with drafts
* Defer media description update until after upload finishes
* Make description field 2 lines for better visibility of hint text
* Reuse Gson instance
* Force retranslation of modified string "hint_describe_for_visually_impaired"
* Add bounds check when reading serialized media descriptions
