Add enumsc and enumscstr.

[phidebian]

Add enumsc and enumscstr, an enum for start cond instead of define and the optional enum to string array for easier debug printout.

[phidebian]

I am writting a lex scanner (actually many) with a good number of SC, beeing able to printout the SC in text is a good help in the debug print out. the cost of change is modest.

Note I did this quick'n'dirty, I didn't check if this exit already in other clones.....

Cheers.

[westes]

Can you see about the conflicts that have ben introduced from the merging in of #489?

[Explorer09]

Flex allows bool type for the enumsc and enumscstr flags. Please use that instead of int. It helps readability.