0.2, minor but important improvement

define directives inside if directives

Added support for define directives to be commented out when inside other directives like if or else ones.

This will make the following code:

##if defined NOT_DEFINED_THING
##define SOMETHING_THAT_SHOULD_NOT_BE_DEFINED
##endif

into:

##if defined NOT_DEFINED_THING
#--##define SOMETHING_THAT_SHOULD_NOT_BE_DEFINED
##endif

And SOMETHING_THAT_SHOULD_NOT_BE_DEFINED wont be added to the define list used to check with ##ifs

Hope you like it. Bye.