Behaves similarly to the DatabaseUpgradeActivity. You have a
static list of ExperienceUpgrade models that include a "trigger"
version, where when a user upgrades through it a notification
will appear, and there will be a splash explanation screen.
Right now the splash screens are basic and not too configurable,
but that can be reworked as upgrades demand.
Closes#4151
1. Switch from 300 to 500 colors.
2. Colorize incoming conversation bubbles.
3. Colorize recipeint preference activity toolbar.
4. Support inverted colors in avatars.
5. Make status bar icons tint according to secondary color.
// FREEBIE
1) No more blue/green for outgoing messages. Just lock or no lock.
2) Use 9-patches instead of shapes for better bubble performance.
3) Use tinting rather than different colored assets.
4) Change outgoing status indicators so that they don't change
width of the bubble as they update.
5) Switch to using ..., check, double-check for pending, sent,
delivered rather than using bubble tone to indicate pending.
// FREEBIE
Moxie Marlinspike
Jake McGinty
Drew Hintz