Please note that many of the icons in the folder are under the Apache v2
license, not the GPLv2. These icons have been copied from the material
design icon set https://material.io/resources/icons/

Usually, these two license are considered incompatible because of the
patent termination clause in the Apache v2 license, however with icons
that seems to be an entirely moot point. Based on that judgment call,
I decided to include these icons in this project, but under the explicit
provision that they are clearly NOT derived from our code and that they
therefore remain under the Apache v2 license.

This affects at least these icons:

cloud_sync_24px.svg -> cloud_sync.svg
ic_adb_black_24px.svg -> ic_adb.svg
ic_add_black_24px.svg -> ic_add.svg
ic_add_location_24px.svg -> ic_add_location.svg
ic_clear_black_24px.svg -> ic_clear.svg
ic_cloud_done_black_24px.svg -> ic_cloud_done.svg
ic_cloud_download_24px.svg -> ic_cloud_download.svg
ic_cloud_off_black_24px.svg -> ic_cloud_off.svg
ic_cloud_upload_24px.svg -> ic_cloud_upload.svg
ic_gps_fixed_24px.svg -> ic_gps_fixed.svg
ic_help_outline_24px.svg -> ic_help_outline.svg
ic_home_24px.svg -> ic_home.svg
ic_info_outline_24px.svg -> ic_info_outline.svg
ic_location_off_black_24px.svg -> ic_location_off.svg
ic_place_black_24px.svg -> ic_place.svg
ic_settings_24px.svg -> ic_settings.svg
ic_sync_24px.svg -> ic_sync.svg
account_circle-24px.svg -> account_circle.svg
contact_support-24px.svg -> contact_support.svg
