Fix various lint warnings (#4409)

- Remove empty file `ExampleInstrumentedTest.java`.
- Replace deprecated `MigrationTestHelper` constructor call.
- Add reified inline extension methods for `Bundle` and `Intent` to
retrieve `Parcelable` and `Serializable` objects by calling the core
`BundleCompat` and `IntentCompat` methods, to allow shorter syntax and
removing the need to pass the class explicitly.
- Replace deprecated `drawable.setColorFilter()` with simpler
`drawable.setTint()` (uses blend mode `SRC_IN` by default, has the same
effect as `SRC_ATOP` when the source is a color).
- Rename shadowed variables (mostly caught exceptions).
- Remove unnecessary `.orEmpty()` on non-null fields.
- Replace `.size() == 0` with `.isEmpty()`.
- Prevent `NullPointerException` when `account.getDisplayName()` is
`null` in `StatusBaseViewHolder.setDisplayName()`.
- Declare `customEmojis` argument as non-null in
`StatusBaseViewHolder.setDisplayName()` because it calls
`CustomEmojiHelper.emojify()` which now requires it to be non-null.
- Prevent `NullPointerException` when no matching filter is found in
`StatusBaseViewHolder.setupFilterPlaceholder()`.
- Remove deprecated call to `setTargetFragment()` (target fragment is
not used anyway).
- Remove deprecated call to `isUserVisibleHint()` and test if the view
has been destroyed instead.
- Remove some unused imports.
- Remove unnecessary casts.
- Rename arguments to supertype names when a warning is shown.
- Prevent a potential memory leak by clearing the
`toolbarVisibilityDisposable` reference in `onDestroyView()`.

app/src/main/java/com/keylesspalace/tusky/MainActivity.kt

@@ -45,7 +45,6 @@ import androidx.appcompat.content.res.AppCompatResources
 import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
-import androidx.core.content.IntentCompat
 import androidx.core.content.pm.ShortcutManagerCompat
 import androidx.core.view.GravityCompat
 import androidx.core.view.MenuProvider
@@ -107,6 +106,7 @@ import com.keylesspalace.tusky.util.ShareShortcutHelper
 import com.keylesspalace.tusky.util.deleteStaleCachedMedia
 import com.keylesspalace.tusky.util.emojify
 import com.keylesspalace.tusky.util.getDimension
+import com.keylesspalace.tusky.util.getParcelableExtraCompat
 import com.keylesspalace.tusky.util.hide
 import com.keylesspalace.tusky.util.reduceSwipeSensitivity
 import com.keylesspalace.tusky.util.show
@@ -531,11 +531,8 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
     }
 
     private fun forwardToComposeActivity(intent: Intent) {
-        val composeOptions = IntentCompat.getParcelableExtra(
-            intent,
-            COMPOSE_OPTIONS,
-            ComposeActivity.ComposeOptions::class.java
-        )
+        val composeOptions =
+            intent.getParcelableExtraCompat<ComposeActivity.ComposeOptions>(COMPOSE_OPTIONS)
 
         val composeIntent = if (composeOptions != null) {
             ComposeActivity.startIntent(this, composeOptions)