- allow changing the nick color by clicking the dispay-name in the room
  member detail page.
- the ovirride-color can be specified as a hex string (#rrggbb) or as palette
  index (2)
- entering an invalid color code or leaving the field blank reverts to
  the default hash-based nick color
- the setting is stored in `account_data` as `im.vector.setting.override_colors`

- future improvements / notes:
  - replace the text-based color entry with a proper color picker dialog
  - make the feature more discoverable
  - the color change listener is now in AppStateHandler, not sure if this is
    the best place
  - implement override color support in element-web / element-desktop, too

Signed-off-by: Péter Radics <mitchnull@gmail.com>

…ndroid into feature/issue-2610-override-nick-color-via-user-account-data

…lement-android into feature/issue-2610-override-nick-color-via-user-account-data

Remove the click handler that opens the override color dialog from the
display-name part on the member profile page, as this is not really
discoverable and we have a proper menu item for it now.

…lement-android into feature/issue-2610-override-nick-color-via-user-account-data

…lement-android into feature/issue-2610-override-nick-color-via-user-account-data

…lement-android into feature/issue-2610-override-nick-color-via-user-account-data

…lement-android into feature/issue-2610-override-nick-color-via-user-account-data

…erge branch 'develop' of https://github.com/vector-im/element-android into feature/issue-2610-override-nick-color-via-user-account-data

…develop' of github.com:mitchnull/element-android into feature/issue-2610-override-nick-color-via-user-account-data

…ndroid into feature/issue-2610-override-nick-color-via-user-account-data

…ndroid into feature/issue-2610-override-nick-color-via-user-account-data

…a-user-account-data