Add syntax highlight for primitive data types

Syntax highlight rules for keywords are changed to highlight control
keywords and primitive data types separately.

Change-Id: Ifb25be7a97b92589030aa190641320c233dc7f2d
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/texteditor/texteditorconstants.h

@@ -59,6 +59,7 @@ enum TextStyle {
     C_VIRTUAL_METHOD,
     C_FUNCTION,
     C_KEYWORD,
+    C_PRIMITIVE_TYPE,
     C_OPERATOR,
     C_PREPROCESSOR,
     C_LABEL,