Xpra

* fix focus regression
* fix MS Windows clipboard copy including null byte
* fix h264 decoding with old versions of avcodec
* fix potential invalid read past the end of the buffer
* fix static vpx build arguments
* fix RGB modes exposed for transparent windows
* fix crash on clipboard loops: detect and disable clipboard
* support for ffmpeg version 2.x
* support for video encoding of windows bigger than 4k
* support video encoders that re-start the stream
* fix crash in decoding error path
* forward compatibility with namespace changes
* forward compatibility with the new generic encoding names

* fix h264 decoding of padded images
* fix plain RGB encoding with very old clients
* fix "xpra info" error when old clients are connected
* remove warning when "help" is specified as encoding

* fix misapplied patch breaking all windows with transparency

* fix client crash on Linux with AMD cards and fglrx driver
* fix MS Windows tray forwarding (was broken by fix from 0.10.6)
* fix missing WM_CLASS on X11 clients
* fix Mac OSX shadow server
* fix "xpra info" on shadow servers
* add usable 1366x768 dummy resolution

* fix window titles reverting to "unknown host"
* fix tray forwarding bug causing client disconnections
* replace previous rencode fix with warning

* fix client time out when the initial connection fails
* fix shadow mode
* fix connection failures when some system information is missing
* fix client disconnection requests
* fix encryption cipher error messages
* fix client errors when some features are disabled
* fix potential rencode bug with unhandled data types
* error out if the client requests authentication and none is available