Replace Android picker with custom multi-image picker.
update with new plugin layout and rejigged iOS inspector
add in new plugin and inspector structures
new plugin structure, update for GSON in Android
clean up demo JS a little
update to latest platform version, remove plugin UUID to avoid confusion
update demo to check isFile after capture
Don't explictly close cursor, let ManagedQuery handle it. Fixes StaleDataException when resuming with image picker open.