[dav] have GetStatusTag() iterate over XML elements, not nodes.

As things are, if there are no children of the passed element, we'll have a NULL dereference.
[dav] iterate over XML elements not Nodes in CDavDirectory::ParseResponse() as we assume elements inside the loops anyway
[rssdirectory] have a helper for getting the value of a child XML element rather than calling GetText() and assuming a non-NULL response
[edl] use FirstChild()->Value() rather than GetText() in parsing cut times
[pls playlist] use FirstChild()->Value() rather than GetText() without NULL checks
[advancedsettings] use FirstChild()->Value() rather than GetText() when reading DNS cache entries
[fanart] use FirstChild()->Value() rather than unchecked GetText().

NOTE: Potential change in behaviour in that if a url attribute is specified in the <fanart>
node and <thumb> children are specified without a value, it used to just take url as the
url.  This was not intended, however, as url is supposed to be the base url, not the full url.
[buttontranslator] tidy the MapRemote and MapJoystickActions functions to not use unchecked GetText()
[cosmetic] indenting
[buttontranslator] kill unnecessary ifdefs
[cosmetic] remove duplicate access modifier in CGUIMediaWindow
[pvr] refactor directory path preparation out of Update() method

This fixes an issue where we get an infinity loop cause by a fallback done
in GUIMediaWindow::Update() if GetDirectory() return false. This effects only
some of the PVR related windows, because there we override the directory path
directly within the Update() method and the strDirectory param is discarded.
[pvr] unify settings to control of showing channel info on channel switch

This unifies the settings 'pvrmenu.infoswitch', 'pvrmenu.infotimeout',
'pvrmenu.infotime' to one new setting 'pvrmenu.displaychannelinfo'
which holds the options 'Off' and '1 sec' to '15 sec'.
[pvr] show channel info after channel switch from within channel osd
Merge pull request #5052 from xhaggi/fix-pvr-directory-update-infinity-loop

[pvr] fix: directory update infinity loop if GetDirectory() return false
Merge pull request #5034 from jmarshallnz/drop_gettext

Drop GetText usage in tinyxml
Merge pull request #5060 from xhaggi/pvr-setting-displaychannelinfo

[pvr] unify channel info settings + show channel info after channel switch from within channel osd
revert default value after #5060

missed by the review
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)