Properly parse filenames for r and w

[aureliojargas]

From the GNU sed documentation:

https://www.gnu.org/software/sed/manual/sed.html#Commands-Requiring-a-newline

The r,R,w,W commands parse the filename until end of the line. If whitespace, comments or semicolons are found, they will be included in the filename, leading to unexpected results.

Sedsed current matching for filenames:

# Regex patterns to identify special entities
patt = {
    #...
    'filename': r'[^\s]+',   # _any_ not blank char (strange..)
    #...
}

There's a clear mismatch here. My code is wrong. Fix it.

[aureliojargas]

Fixed by the new sedparse parser, see #52.

$ ./sedsed.py -e "rfoo;#bar.txt"
r foo;#bar.txt
$