* first draft of dark mode, still needs some work
* changed dark mode colors
* fixed more buttons in dark mode
* Ran linter and fixed a few things
* mades things more kotlin-like
* added night mode selector in settings, but doesn't seem to work
* WIP Theme settings
* Fix callback not getting called (not registered)
* added theme test
* removed useless strings
* Fix dark mode not being applied
* Our app isn't called ThemedApplication and fixed fix
* changed default theme for API versions lower than 29
* WIP splashscreen nightmode
* Added custom splashscreen
* added night mode for splashscreen
* removed useless night values
* adapted icons for dark mode
* fixed light mode colors
* fixed a few light mode color bugs
* fixed bad login button
* fixed search tabs color
* fixed weird text input in post creation
* removed hardcoded strings in settings test
* removed unnecessary margin in login activity
* replace getIntrumentation.context with getInstrumentation.targetContext in settings test
Co-authored-by: Matthieu De Beule <61561059+Wv5twkFEKh54vo4tta9yu7dHa3@users.noreply.github.com>