Removed outdated copyright headers, improved vector path data

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

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

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

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

app/src/main/res/layout-sw600dp-land/setup_slide.xml

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

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

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

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