Replaces lower case implementation

CHANGES

@@ -1,6 +1,8 @@
 v3.x.y - YYYY-MMM-DD (to be released)
 -------------------------------------
   
+  - Replaced t:lowerCase backend for a better performance.
+    [@zimmerle]
   - More structured rules dump. Better supporting debugging.
     [@zimmerle]
   - Added the basics for supporting better error/warning handling while

src/actions/transformations/lower_case.cc

@@ -30,11 +30,8 @@ namespace transformations {
 void LowerCase::execute(Transaction *t,
     ModSecString &in,
     ModSecString &out) {
-    std::locale loc;
     out.resize(in.size());
-    for (std::string::size_type i=0; i < in.size(); ++i) {
-        out[i] = std::tolower(in[i], loc);
-    }
+    std::transform(in.begin(), in.end(), out.begin(), ::tolower);
 }