Improve settings and license screen UI

app/src/main/AndroidManifest.xml

...ain/java/de/kuschku/quasseldroid/dagger/ActivityModule.kt

...seldroid/ui/clientsettings/about/AboutSettingsFragment.kt

...e/kuschku/quasseldroid/ui/clientsettings/about/Library.kt

...ku/quasseldroid/ui/clientsettings/about/LibraryAdapter.kt

...roid/ui/clientsettings/license/LicenseSettingsActivity.kt

...roid/ui/clientsettings/license/LicenseSettingsFragment.kt

...chku/quasseldroid/ui/coresettings/CoreSettingsFragment.kt

...a/de/kuschku/quasseldroid/ui/coresettings/SettingsItem.kt

...schku/quasseldroid/ui/coresettings/SettingsItemAdapter.kt

...asseldroid/ui/coresettings/identity/IdentitiesActivity.kt

...asseldroid/ui/coresettings/identity/IdentitiesFragment.kt

...id/ui/coresettings/identity/IdentitiesFragmentProvider.kt

...quasseldroid/ui/coresettings/identity/IdentityFragment.kt

app/src/main/res/drawable/ic_list_bulleted.xml

app/src/main/res/layout/fragment_about.xml

app/src/main/res/layout/fragment_chat_list.xml

app/src/main/res/layout/fragment_crash.xml

app/src/main/res/layout/fragment_license.xml

app/src/main/res/layout/fragment_messages.xml