Implement identity editing

app/src/main/AndroidManifest.xml

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

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

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

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

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

...quasseldroid/ui/coresettings/identity/IdentityActivity.kt

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

...roid/ui/coresettings/identity/IdentityFragmentProvider.kt

...seldroid/ui/coresettings/identity/IdentityNicksAdapter.kt

...id/ui/coresettings/networkconfig/NetworkConfigFragment.kt

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

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

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

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

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

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

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

app/src/main/res/values-de/strings.xml

app/src/main/res/values-de/strings_settings.xml