Update LLFloaterModelPreview and make it compile~

Collada include_directories and llfloatermodelpreview.*s added to CMakeLists.txt
Update to v-d, compile with AIFilePicker, comment spelling fixes.
Upload Mesh... entry added to File menu.
Updated AIFilePicker to have FFLOAD_COLLADA with an mFilter of "dae"
And, finally, add floater_model_preview.xml~

indra/newview/statemachine/aifilepicker.cpp

@@ -147,6 +147,9 @@ void AIFilePicker::open(ELoadFilter filter, std::string const& default_path, std
 	  case FFLOAD_ANIM:
 		  mFilter = "anim";
 		  break;
+	  case FFLOAD_COLLADA:
+		  mFilter = "dae";
+		  break;
 #ifdef _CORY_TESTING
 	  case FFLOAD_GEOMETRY:
 		  mFilter = "geometry";

indra/newview/statemachine/aifilepicker.h

@@ -43,6 +43,7 @@ enum ELoadFilter
 	FFLOAD_WAV,
 	FFLOAD_IMAGE,
 	FFLOAD_ANIM,
+	FFLOAD_COLLADA,
 	FFLOAD_XML,
 	FFLOAD_SLOBJECT,
 	FFLOAD_RAW,