Reorganized core/ directory, it was too fatty already

-Removed FuncRef, since Callable makes it obsolete
-Removed int_types.h as its obsolete in c++11+
-Changed color names code

modules/mono/utils/mono_reg_utils.h

@@ -33,7 +33,7 @@
 
 #ifdef WINDOWS_ENABLED
 
-#include "core/ustring.h"
+#include "core/string/ustring.h"
 
 struct MonoRegInfo {
 	String version;

modules/mono/utils/osx_utils.cpp

@@ -32,7 +32,7 @@
 
 #ifdef OSX_ENABLED
 
-#include "core/print_string.h"
+#include "core/string/print_string.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreServices/CoreServices.h>

modules/mono/utils/osx_utils.h

@@ -28,7 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#include "core/ustring.h"
+#include "core/string/ustring.h"
 
 #ifndef OSX_UTILS_H
 #define OSX_UTILS_H

modules/mono/utils/path_utils.cpp

@@ -30,10 +30,10 @@
 
 #include "path_utils.h"
 
+#include "core/config/project_settings.h"
 #include "core/os/dir_access.h"
 #include "core/os/file_access.h"
 #include "core/os/os.h"
-#include "core/project_settings.h"
 
 #ifdef WINDOWS_ENABLED
 #include <windows.h>

modules/mono/utils/path_utils.h

@@ -31,8 +31,8 @@
 #ifndef PATH_UTILS_H
 #define PATH_UTILS_H
 
-#include "core/string_builder.h"
-#include "core/ustring.h"
+#include "core/string/string_builder.h"
+#include "core/string/ustring.h"
 
 namespace path {
 

modules/mono/utils/string_utils.h

@@ -31,8 +31,8 @@
 #ifndef STRING_FORMAT_H
 #define STRING_FORMAT_H
 
-#include "core/ustring.h"
-#include "core/variant.h"
+#include "core/string/ustring.h"
+#include "core/variant/variant.h"
 
 #include <stdarg.h>