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>

README.md

@@ -241,8 +241,11 @@ options:
 
 ```INI
 [main]
-path_filter_fat = True			; replace FAT file system unsafe characters in filenames with _
-path_filter_special = False		; replace special characters in filenames with _
+path_filter_dot = True			; replace leading dot with _
+path_filter_posix = True		; replace illegal chars in *nix OSes with _
+path_filter_vfat = False		; replace illegal chars in VFAT filesystems with _
+path_filter_whitespace = False		; replace all whitespace chars with _
+path_filter_printable = False		; replace all non printable ASCII chars with _
 
 [musicbrainz]
 server = https://musicbrainz.org	; use MusicBrainz server at host[:port]