Implement highlight rule management UI

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

...settings/highlightlist/DragSortItemTouchHelperCallback.kt

...id/ui/coresettings/highlightlist/HighlightListFragment.kt

...ui/coresettings/highlightlist/HighlightNickTypeAdapter.kt

...id/ui/coresettings/highlightlist/HighlightNickTypeItem.kt

...oid/ui/coresettings/highlightlist/HighlightRuleAdapter.kt

...id/ui/coresettings/highlightrule/HighlightRuleActivity.kt

...id/ui/coresettings/highlightrule/HighlightRuleFragment.kt

...seldroid/ui/coresettings/ignoreitem/IgnoreItemFragment.kt

...sseldroid/ui/coresettings/ignorelist/IgnoreListAdapter.kt

...seldroid/ui/coresettings/ignorelist/IgnoreListFragment.kt

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

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

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

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

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

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

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

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

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