Add feature to Browse commons via app (#1716)

* Search activity, image search fragment added

* Removed explore icon xml

* Updated Javadocs for search Activity and Navigation Base Activity

* SearchImageItem class updated

* Javadocs added for search activity

* removed redundant code and added javadocs for search image modules

* Javadocs added for updateImageList  method

* Rename featuredImage to explore

* Fixed null query issue

* changed cisibility to gone in case of successful Fetch

* Consolidate the networking libraries - drop volley in favor of OkHttp

* Extracted a few networking related items into a new Dagger module and finished the process of mocking the main component for tests.

* Refactoring to extract GpsCategoryModel and ensure single-responsibility-principle is maintained in CategoryApi.

* fixed featured image back bug

* Localisation updates from https://translatewiki.net.

* Javadocs added

* Add option to set image as wallpaper (#1535)

* Add option to set image as wallpaper

* Added java docs

* Toast message on setting the wallpaper successfully

* Localisation updates from https://translatewiki.net.

* SearchHistory Fragment added

* Search History Item added

* Content Provider, RecentSearchesDao added

* Database version changed to 7 and added methods for find, save ,..

* Delete icon deleted

* Reverted changes in gradle files

* Reverted changes in gradle files 2

* Optimized Improts

* reverted refractor for container name

* Refactored packagename, changed name to query in POJO class.

* Updated lastUsed to lastSearched

* Javadocs updated

* Check if user has been in search page for 5 seconds if yes then save it to history

* If else indentation updated

* added import in test

* edittext replaced with Searchview

* RxSearchview added

* Added support for API 21+

* Snackbar removed on success

* Improved code

* Pagination added

* Removed unnecessary toast

* Comment added in method

* Support for landscape mode added

* Fixed screen rotation issue on Explore and Search activity

* Clear focus added

* Delete all function added in Content Provider and called from fragment

* Scrollbar Recyclerview added

* Share Icon changed to 32 dp and back button added in explore, search activity.

* Removed unnecessary code

* Wrote and run tests for Recent Searches
 (creating db, migrating from versions, deletion, finding,..

* Category Search Fragment added

* Adapter factory added

* Renderer added

* Improvements

* Viewpager adapter added

* Updated XML

* Improvements in category card design

* tabs colors changed

* renamed images to media

* Java docs improved

* Javadoc added for setTabs

* JavaDoc for ViewPagerAdapter added

* Refreshed listview after delete

* Added mediaContainer

* Fixed ghost issue in image search fragment

* Ghost issue for categories fixed

* Removed Calling API call onback press

* Category Details activity added

* Menu added in category details activity

* back button added

* back button bugs

* Improvements in category images fragment

* JavaDoc added for some methods

* trimming added, Tab layout hided, recent searches refreshed

* SubCategory list fragment added, API added to extract subCategory Details

* API params updated to get more precise results

* Javadocs added for MWAPI method

* Pagination removed

* Fix API for fetching images inside category

* Parent category API added

* Fix #1704

* Fix #1704 corrected

* Fix #1702

* Fix #1702 and #1704

* added try catch statements

* Optimimzed imports

* loops replaced with Functions

* Javadocs for various methods added

* Fix java docs for Dao

* Javadocs for various methods added

* Fix java docs for Dao

* More javadocs added for explore Feature

* Javadocs added

* Javadocs added

* Improvements in indentation (#1739)

app/src/test/kotlin/fr/free/nrw/commons/TestCommonsApplication.kt

@@ -38,7 +38,6 @@ class MockCommonsApplicationModule(appContext: Context) : CommonsApplicationModu
     val accountUtil: AccountUtil = mock()
     val appSharedPreferences: SharedPreferences = mock()
     val defaultSharedPreferences: SharedPreferences = mock()
-    val categorySharedPreferences: SharedPreferences = mock()
     val otherSharedPreferences: SharedPreferences = mock()
     val uploadController: UploadController = mock()
     val mockSessionManager: SessionManager = mock()