Deprecation warning GfsPreparationFilter

[justb4]

Zelfde soort issue als #387. In gfspreparationfilter.py L169:

Warning:

/nlx/stetlcomponents/gfspreparationfilter.py:169: SyntaxWarning: invalid escape sequence '\w'
  pattern = re.compile(b'Layer name: (\w+:)?(?P<elemtype>\w+).*?Feature Count: (?P<featurecount>[0-9]+)', re.S)

Dus
re.compile(b'Layer name: (\w+:)?(?P<elemtype>\w+).*?Feature Count: (?P<featurecount>[0-9]+)', re.S)

moet worden

re.compile(r'Layer name: (\w+:)?(?P<elemtype>\w+).*?Feature Count: (?P<featurecount>[0-9]+)', re.S)

[justb4]

hmm moet zijn:
re.compile(rb'Layer name: (\w+:)?(?P<elemtype>\w+).*?Feature Count: (?P<featurecount>[0-9]+)', re.S)