Initial version after upgrade to new packages

Old packages were migrated to new versions because the new Android API does not work with the old ones.
Some packages were not compatible at all - so migration to something else was needed (e.g. showcase library).

Changelog:

• Added option to choose server address
• Migrated to new showcase library
• Added hidden section in the settings page for manually setting the radius of the search
• Added section for requesting app permissions (up until now user would have to manually add permissions)
• Some text fixes (e.g. typos, brevity, etc.)
• Some minor fixes regarding networking
• Many improvements to the overall performance