#65 code_begin and code_end should allow new line

[romain145]

Some machines may require multiple M-codes at the beginning and the end. For instance my machine needs the following:

code_begin = M92 M95
code_end = M95 M92 M02 M40

I suggest the parsing should handle the "%nl" special character for these lines as well.

[J-P]

Fixed it on the Master branch

[romain145]

Working, thanks!