Android: Only have one settings entrypoint per activity/dialog

Basically, instead of having one button for config, one button
for graphics settings and so on, we now have just one settings
button which takes you to a screen where you pick between
config/graphics/GameCube controllers/Wii Remotes.

The main reason I want to do this is because people still have
trouble finding Overlay Controls in the "new" in-game menu.
Typically (depending on the screen size and the length of the
game name), the scrollable part of the menu can fit 4 items,
and merging Config and Graphics Settings into one item would
move Overlay Controls from 5th place to 4th place (assuming the
user doesn't have savestates enabled), which makes it findable
even for users who don't realize the menu can be scrolled.

The dialog that's shown when long pressing a game in the game
list is also shortened. While not a pressing matter, I think
it was getting a bit long.

An additional reason to do this is because we probably will
want to make it possible to edit the controller settings
from the in-game menu at some point in the future. With the
old approach, this would require us to dedicate a whopping 4
menu items just for settings (not including Overlay Controls),
which I think is excessive.

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

@@ -121,6 +121,12 @@
     <string name="turntable_effect_dial">Dial</string>
     <string name="turntable_crossfade">Crossfade</string>
 
+    <!-- Main Preference Fragment -->
+    <string name="config">Config</string>
+    <string name="graphics_settings">Graphics Settings</string>
+    <string name="gcpad_settings">GameCube Input</string>
+    <string name="wiimote_settings">Wii Input</string>
+
     <!-- General Preference Fragment -->
     <string name="general_submenu">General</string>
     <string name="dual_core">Dual Core</string>
@@ -319,10 +325,7 @@
 
     <!-- Game Grid Screen-->
     <string name="add_directory_title">Add Folder to Library</string>
-    <string name="grid_menu_config">Config</string>
-    <string name="grid_menu_graphics_settings">Graphics Settings</string>
-    <string name="grid_menu_gcpad_settings">GameCube Input</string>
-    <string name="grid_menu_wiimote_settings">Wii Input</string>
+    <string name="grid_menu_settings">Settings</string>
     <string name="grid_menu_refresh">Refresh Library</string>
     <string name="grid_menu_open_file">Open File</string>
     <string name="grid_menu_install_wad">Install WAD</string>