Release 0.8.0

• Update to Gradle 7 (see https://gitlab.com/JOSM/gradle-josm-plugin/-/merge_requests/8) // 8beb3a6..2dfe304
• JOSM plugins can now also depend on external JOSM plugins (see https://gitlab.com/JOSM/gradle-josm-plugin/-/issues/1 and https://gitlab.com/JOSM/gradle-josm-plugin/-/merge_requests/9) // 39f8aa3
• major extension of the i18n file processing, is now done natively by the plugin itself instead of gettext command line tools (also outputs nice progress bars) // f3f9063..b979b79 810ac6c 8beb3a6..9c3d7f6
• the source files of JOSM are now available via gradle for easier debugging in IDEs (see https://gitlab.com/JOSM/gradle-josm-plugin/-/issues/10) // 8a732f7
• the plugin is now also published to MavenCentral (see https://gitlab.com/JOSM/gradle-josm-plugin/-/issues/15)
• some smaller fixes, see https://gitlab.com/JOSM/gradle-josm-plugin/-/compare/v0.7.1...v0.8.0 for the full changelog

When updating to this version, make sure to update to a Gradle version >= 7.1 (it was tested with Gradle versions between 7.1.1 and 7.3.3).