3.7 Release

* Add changelog

* Bump version

* Add changelog for F-Droid

* Added fullscreen mode

* Corrected spelling to 'full screen'

* Update fab_menu.xml

* Small clean up of toggleFullscreen

* Do not unnecessarily ask for storage write permission on Android 11

* Fix download PDF not working via HTTP on recent Android versions

* Add missing READ_EXTERNAL_STORAGE permission to manifest

* Reword storage permission request message in intro

* Fix strings wrongly marked as non-translatable

* Handle missing READ_EXTERNAL_STORAGE permission when opening file

* Tweak action_about Italian string to better distinguish it from settings

* Use correct icon for document info dialog

* Remove non-existing WRITE_INTERNAL_STORAGE permission from manifest

Miscellaneous fixes to sharing intents

Simplify logic for reading intent URI

Updated German translation

Save activity state the Android way (and ditch AndroidAnnotations)

Fix bottom bar colors and ripple (this time for real)

3.6 Release

Reload document automatically after closing settings