Android: Warn when path in config is unavailable

Content URIs stop working if Dolphin loses permissions,
which happens for instance when reinstalling Dolphin.

Source/Android/app/src/main/res/drawable/invalid_setting_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:attr/selectableItemBackground"/>
+    <item>
+        <shape>
+            <solid android:color="@color/invalid_setting_overlay" />
+        </shape>
+    </item>
+</layer-list>

Source/Android/app/src/main/res/values/colors.xml

@@ -11,4 +11,6 @@
 
     <color name="tv_card_unselected">#444444</color>
 
+    <color name="invalid_setting_overlay">#36ff0000</color>
+
 </resources>

Source/Android/app/src/main/res/values/strings.xml

@@ -311,6 +311,7 @@
     <string name="clear">Clear</string>
     <string name="disabled">Disabled</string>
     <string name="other">Other</string>
+    <string name="continue_anyway">Continue Anyway</string>
 
     <!-- Game Grid Screen-->
     <string name="add_directory_title">Add Folder to Library</string>
@@ -431,6 +432,7 @@ It can efficiently compress both junk data and encrypted Wii data.
     <string name="no_file_extension">The selected file does not appear to have a file name extension.\n\nContinue anyway?</string>
     <string name="wrong_file_extension_single">The selected file has the file name extension \"%1$s\", but \"%2$s\" was expected.\n\nContinue anyway?</string>
     <string name="wrong_file_extension_multiple">The selected file has the file name extension \"%1$s\", but one of these extensions was expected: %2$s\n\nContinue anyway?</string>
+    <string name="unavailable_paths">Dolphin does not have permission to access one or more configured paths. Would you like to fix this before starting?</string>
 
     <!-- Misc -->
     <string name="pitch">Total Pitch</string>