address various minor issues brought up during fdroid review (#399)
- compress mock poster image files
- improved location permission handling to prevent premature return
- tmdb person details falls back to system brower instead of in-app browser
- update full_description to use proper
- elements + include external metadata disclosure
- remove unused cloudy dependency
- findByName instead of getByName for release signing to prevent failures when signing configs are stripped (eg by fdroid)
Full Changelog: v0.10.3...v0.10.4