Android: Add the advanced input mapping dialog

It's missing a lot of features from the PC version for now, like
buttons for inserting functions and the ability to see what the
expression evaluates to. I mostly just wanted to get something in
place so you can set up rumble.

Co-authored-by: Charles Lombardo <[email protected]>

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

@@ -50,6 +50,9 @@
     <string name="input_binding">Input Binding</string>
     <string name="input_binding_description">Press or move an input to bind it to %1$s.</string>
     <string name="input_binding_no_device">You need to select a device first!</string>
+    <string name="input_configure_input">Configure Input</string>
+    <string name="input_configure_output">Configure Output</string>
+    <string name="input_expression">Expression</string>
 
     <!-- Main Preference Fragment -->
     <string name="settings">Settings</string>
@@ -420,6 +423,7 @@
     <string name="other">Other</string>
     <string name="continue_anyway">Continue Anyway</string>
     <string name="more_settings">More Settings</string>
+    <string name="advanced_settings">Advanced Settings</string>
 
     <!-- Game Grid Screen-->
     <string name="platform_gamecube">GameCube Games</string>