Alow [en|dis]abling of uncrustify

With

    // *uncrustify-off*

    ...

    // *uncrustify-on*

it is now possible to disable uncrustify for a particular code block.
Comes in handy at times.

uncrustify.cfg

@@ -30,10 +30,10 @@ string_replace_tab_chars        = false    # false/true
 tok_split_gte                   = false    # false/true
 
 # Override the default ' *INDENT-OFF*' in comments for disabling processing of part of the file.
-disable_processing_cmt          = ""         # string
+disable_processing_cmt          = "*uncrustify-off*"        # string
 
 # Override the default ' *INDENT-ON*' in comments for enabling processing of part of the file.
-enable_processing_cmt           = ""         # string
+enable_processing_cmt           = "*uncrustify-on*"         # string
 
 # Enable parsing of digraphs. Default=False.
 enable_digraphs                 = true    # false/true