Rename "[Mm]ethod(s)" to "[Ff]unction(s)"

Only methods as programming functions are affected. Besides renaming
some actions like "Switch Between Function Declaration/Definition" this
mostly touches (api) code comments.

This is a follow-up patch to commit 872bfb7.

Change-Id: Icb65e8d73b59a022f8885b14df497169543a3b92
Reviewed-by: hjk <hjk121@nokiamail.com>

src/libs/glsl/glslast.h

@@ -751,7 +751,7 @@ public:
             : AST(Kind_StructField), name(_name), type(0) {}
 
         // Takes the outer shell of an array type with the innermost
-        // element type set to null.  The fixInnerTypes() method will
+        // element type set to null.  The fixInnerTypes() function will
         // set the innermost element type to a meaningful value.
         Field(const QString *_name, TypeAST *_type)
             : AST(Kind_StructField), name(_name), type(_type) {}