* Convert OkHttpJsonApiClient and CategoryApi to kotlin
* Convert GsonUtil to kotlin
* Convert WikidataConstants to kotlin
* Convert WikidataEditListener to kotlin
* Convert WikidataEditService to kotlin
* work in progress
* Convert RequiredFieldsCheckOnReadTypeAdapterFactory to kotlin
* Converted type adapters
* Convert WikiSiteTypeAdapter to kotlin
* Fixed nullability
* logErrorsInsteadOfCrashing only ever returned false, so remove it and simplify logger
* Removed unused getMediaWikiBaseUrl()
* Removed getDesiredLeadImageDp() from commons app adapter, since it's unused
* Inlined the isLoggedIn() method of the app adapter
* Inline the app adapter username/password
* Removed the unused getRestbaseUriFormat() from the commons app adapter
* Remove references to the data-client SharedPreferenceCookieManager
* Manage our own OkHttpClient and remove the AppAdapter implementation
