Update license display, remove unused libraries

README.md

app/sampledata/libraries.json

...hku/quasseldroid/ui/clientsettings/about/AboutFragment.kt

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

...quasseldroid/ui/clientsettings/license/LicenseFragment.kt

app/src/main/res/raw/license_apache_2.html

app/src/main/res/raw/license_cc_0.html

app/src/main/res/raw/license_cc_by_sa_3_0.html

app/src/main/res/raw/license_dracula.html

app/src/main/res/raw/license_emojijava.html

app/src/main/res/raw/license_gpl_v3.html

app/src/main/res/raw/license_gruvbox.html

app/src/main/res/raw/license_materialdesignicons.html

app/src/main/res/raw/license_materialdialogs.html

app/src/main/res/raw/license_solarized.html

app/src/main/res/raw/license_threetenbp.html

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