Fix compatibility with Android 4.4.

The app was pretty broken on API 19, fixes:
- Remove SelectActivity card background because API 19 does not support XML SVG as bg
- Add simple folder browser for APIs without SAF
- Add simplified version of download notification
- Downgrade and replace incompatible libraries to enable SSL 1.2 on older Android versions

app/src/main/AndroidManifest.xml

@@ -51,6 +51,7 @@
         <activity
             android:name="org.adrianvictor.geleia.activities.SettingsActivity"
             android:label="@string/action_settings" />
+        <activity android:name="org.adrianvictor.geleia.activities.DirectoryPickerActivity"/>
         <activity
             android:name="org.adrianvictor.geleia.activities.AboutActivity"
             android:label="@string/action_about" />
@@ -138,6 +139,12 @@
                 android:resource="@xml/provider_paths" />
         </provider>
 
+        <provider
+            android:name="androidx.startup.InitializationProvider"
+            android:authorities="${applicationId}.androidx-startup"
+            android:exported="false"
+            tools:node="remove" />
+
     </application>
 
 </manifest>