overall whitespace & encoding fixes

patch from Matthias Schwarzott:
- use utf8 everywhere for files & file names

additionally by me:
- remove empty lines at the beginning of the files
- remove any control character (< 0x20) except \n and \t
- remove trailing whitespace
- exactly one newline at the end of the files
- remove junk from dvb-t/au-Melbourne-Upwey

dvb-t/uk-SuttonColdfield

@@ -12,5 +12,3 @@ T 714166670 8MHz 3/4 NONE QAM16 2k 1/32 NONE
 T 722166670 8MHz 3/4 NONE QAM16 2k 1/32 NONE
 # Radio / Audio Multiplex
 T 746000000 8MHz 3/4 NONE QAM16 2k 1/32 NONE
-
-