Rewrite PathFilter

Added filter options:
- dot (replace leading dot with _)
- posix (replace illegal chars in *nix OSes with _)
- vfat (replace illegal chars in VFAT filesystems with _)
- whitespace (replace all whitespace chars with _)
- printable (replace all non printable ASCII chars with _)

Removed filter options:
- fat (replaced with vfat)
- special

Fixes #313.

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/common/program.py

@@ -70,8 +70,11 @@ class Program:
         d = {}
 
         for key, default in list({
-            'fat': True,
-            'special': False
+            'dot': True,
+            'posix': True,
+            'vfat': False,
+            'whitespace': False,
+            'printable': False
         }.items()):
             value = None
             value = self._config.getboolean('main', 'path_filter_' + key)