Refactoring on `utils.cc' and adjacents

Completely removed the `utils.cc' by moving residual functions into
sub-classes of `utils/'

src/variables/variable.cc

@@ -22,12 +22,13 @@
 
 #include "modsecurity/transaction.h"
 #include "variations/exclusion.h"
-#include "src/utils.h"
 #include "utils/msc_string.h"
 
+
 using modsecurity::utils::String;
 using modsecurity::Variables::Variations::Exclusion;
 
+
 namespace modsecurity {
 namespace Variables {