[python/json/appmessenger] Announce DPMS state change to XBMCMonitor and JSON

[herrnst]

Follow-up to #4760, enables addon devs to add onDPMSActivated() and onDPMSDeactivated() methods to their XBMCMonitor classes or just take the JSON notification if they like to be informed if the DPMS state changes (messages are sent from CApplication::ToggleDPMS() ).

[herrnst]

jenkins build this please

[herrnst]

Looks like jenkins had some troubles getting himself sorted on XBMC-LINUX-64...

[herrnst]

ping @Montellese @jimfcarroll ok with this? NB should probably get another jenkins round after the latest rebase.

[Montellese]

Looks good for me.

[jimfcarroll]

Should be fine as long as someone tried it out. It looks fine to me.

[herrnst]

I'm using https://github.com/herrnst/script.xbmc.testing as a little testing addon for this stuff. Upon DPMS activation and deactivation, it happily dumps

16:55:13 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onDPMSActivated()
16:55:13 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - dumping
16:55:13 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - sender: xbmc
16:55:13 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - methods: GUI.OnDPMSActivated
16:55:13 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - data: null
16:55:34 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onDPMSDeactivated()
16:55:34 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - dumping
16:55:34 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - sender: xbmc
16:55:34 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - methods: GUI.OnDPMSDeactivated
16:55:34 T:139697060177664  NOTICE: ### [script.xbmc.testing] - CXBMCMonitor::onNotification() - data: null

to xbmc.log, so addons receive the notifications via XBMCMonitor and JSON. Since this is mostly c/p from the screensaver notification things, I guess it'll work on all platforms. So I'd merge this when jenkins doesn't complain (had to rebase and resolve conflicts in the mean time).

jenkins build this please again