remove ogg/vorbis decoder

now an add-on
remove files now in add-ons
add enable/disable switch for tests
now depends on cpluff
set build type in add-on builds
remove vgmstream

now an add-on
remove timidity

now an add-on
remove snesapu

now an add-on
remove xbadpcm codec

supported in ffmpeg
remove asap

now an add-on
remove outdated entries
start removing mad
get rid of cstdstring in ifile interface
DNSNameCache: get rid of CStdString
callbacks: add function to utilize DNS cache
move defines to xbmc_addon_types.h instead of xbmc_addon_dll.h

xbmc_addon_dll.h cannot be included in more than one compile
unit
add URLEncode add-on callback
add support for vfs add-ons
remove SFTP support

now an add-on
remove NFS support

now an add-on