removed STL usage of Extras/ConvexBuilder and replaced by btAlignedObjectArray

fixed several warnings, thanks to sparkprime
added comments patch for linear math, thanks to Tully Foote

Extras/glui/glui_filebrowser.cpp

@@ -103,7 +103,7 @@ void GLUI_FileBrowser::fbreaddir(const char *d) {
     list->delete_all();
     if (hFind != INVALID_HANDLE_VALUE) {
       do {
-        int len = strlen(FN.cFileName);
+        int len = int(strlen(FN.cFileName));
         if (FN.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
           item = '\\';
           item += FN.cFileName;