Implement direct uploads from Nearby List

[misaochan]

Hooks up the camera and gallery buttons in Nearby List, as part of the requirement for #252 . Title and desc fields are autofilled, similar in scope to #1060 .

Category suggestions and Wikidata edits have not been implemented.

[neslihanturan]

Thanks @misaochan , it works as intended. I restarted Travis CI tests, lets see if it can pass this time.

[neslihanturan]

Travis logs says:
:app:compileBetaDebugUnitTestJavaWithJavac/home/travis/build/commons-app/apps-android-commons/app/src/test/java/fr/free/nrw/commons/nearby/NearbyAdapterFactoryTest.java:127: error: cannot find symbol private class MockPlaceClickedListener implements PlaceRenderer.PlaceClickedListener { ^ symbol: class PlaceClickedListener location: class PlaceRenderer /home/travis/build/commons-app/apps-android-commons/app/src/test/java/fr/free/nrw/commons/nearby/NearbyAdapterFactoryTest.java:41: error: no suitable constructor found for NearbyAdapterFactory(<null>) NearbyAdapterFactory testObject = new NearbyAdapterFactory(null);

[misaochan]

@neslihanturan Yeah, we need to overhaul several of the Nearby tests before releasing the direct uploads feature. However, I'm not sure if we want to block individual PRs for it? AFAIK some Nearby tests would have failed ever since the UI overhaul at the start of this branch (#1018 ).

[neslihanturan]

So there is no block to merging it @misaochan :)