Implement SSL whitelist UI

...seldroid/ui/clientsettings/whitelist/WhitelistFragment.kt

.../ui/clientsettings/whitelist/WhitelistFragmentProvider.kt

...d/ui/clientsettings/whitelist/WhitelistHostnameAdapter.kt

...in/java/de/kuschku/quasseldroid/ui/setup/SetupActivity.kt

app/src/main/res/layout-sw720dp/activity_settings.xml

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

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

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

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

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

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

...ain/res/layout/preferences_whitelist_certificate_item.xml

...c/main/res/layout/preferences_whitelist_hostname_item.xml

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

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

app/src/main/res/menu/activity_settings.xml

app/src/main/res/menu/activity_setup.xml

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

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

app/src/main/res/values-v17/styles_widgets.xml