Zi Ree's Debug Setting Floater awesomeness (Search!!)

Made to work with Singularity, and also be a bit better..
Alphabetizes includes.
Switches settings combobox to a scrolllist, and Boolean combobox to a radiogroup.
Makes floater resizable, aligns a lot of the UI, and prepares it all for proper resize behavior.
Adds Copy button for copying the name of the debug setting.
Yay, verbosity! Also adds FloaterDebugSettingsRect to keep track of the floater's size.

Also somehow the getInstance line snuck out of last commit... tossed it in here.

indra/newview/app_settings/settings.xml

@@ -6178,6 +6178,22 @@ This should be as low as possible, but too low may break functionality</string>
         <integer>0</integer>
       </array>
     </map>
+    <key>FloaterDebugSettingsRect</key>
+    <map>
+      <key>Comment</key>
+      <string>Rectangle for the Debug Settings floater</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Rect</string>
+      <key>Value</key>
+      <array>
+        <integer>0</integer>
+        <integer>300</integer>
+        <integer>245</integer>
+        <integer>0</integer>
+      </array>
+    </map>
     <key>FloaterEnvRect</key>
     <map>
       <key>Comment</key>