Disable channel icon scan when icon path is empty

XBMC checks the icon path and terminates the scan early if no path is set. This commit causes the setting to respect that.
Only print the wayland-egl part of the detected library and not wayland-client.
Forward declare EGLNativeDisplayType.

We were incorrectly forward declaring EGLNativeWindowType instead.
HttpHeader: replace CStdString with std::string + pass data by const ref
CurlFile: don't use CStdString function with HttpHeader
HttpHeader: cosmetics + remove commented out code
HttpHeader: optimizations + rename vars for clarity
HttpHeader::GetHeader: fix: include protocol line into header
(Function not used yet)
HttpHeader::Parse: fixes: skip empty parameters + use for m_protoLine only needed part of string
HttpHeader::Clear: fix: clear m_protoLine
HttpHeader::GetHeader: refactoring
HttpHeader: use vector instead of map for storing header params, move header typedefs into HttpHeader class
[langauge] fix some spelling and clarify "dependencies not met"
fixed, include missing change to -isystem from #3470
[WIN32] added more logging and some smaller changes
update touched skin
confluence cleanup
XBMCTinyXML: refactoring: fully remove CStdString
don't associate m3u playlists with pictures
TinyXML::Parse: refactoring: generate RegExp only when needed, use search for char instead search for string, const ref param allow to call function directly, without re-copying data to new string