Bump version to 2.0.17

• Fix GCC 9 warnings (due to -Wdeprecated-copy)
• dvbtab: remove unused hide cursor logic
• dvbdevice: fix a race condition with frontend timeout
• dvbdevice_linux: improve some warning messages
• mediawidget: fix a regression with next/previous logic
• scanfile.dvb: update it to reflect last changes
• dvbepgdialog: allow showing channels with empty EPG
• index.docbook: some updates at the doc guide
• index.docbook: add documentation about XMLTV support
• Add support for reading EPG from xmltv files
• Add support for disabling MPEG-TS EPG reception
• README.md: add a quick description about xmltv
• dvbconfigdialog: remove an extra addLayout()
• iso-codes: add support for handling 2-letter codes as well
• dvbdevice_linux: remove unused frontendFd
• dvb: fix initialization for some objects
• backend-vlc: don't leak metadata
• backend-vlc: remove two temporary debug logs
• backend-vlc: only release libvlc_media_new() when stopped
• mediawidget: increase language popup size
• mediawidget: define a policy for the audio combo dropbox
• backend-vlc: ensure that audio stream will be a valid value
• backend-vlc: update metadata at stop()
• backend-vlc: release libvlc_media at destroy method
• backend-vlc: add other events to the list of possible types
• backend-vlc: simplify events handling logic
• backend-vlc: print unhandled libVLC events by name
• backend-vlc: update audio streams at metadata change
• mainwindow: associate control bar to main window widget
• backend-vlc: avoid memory leaks
• mainwindow: free configuration at exit
• mainwindow: better implement close event
• backend-vlc: don't leak timer at object destroy
• vlcmediawidget: properly initialize the class
• vlcmediawidget: initialize urlIsAudioCd and trackNumber variables
• backend-vlc: store current audio stream

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>