[client] x11/wayland: add application id #2536

Job	Run time
host-windows-cross	1m 12s
host-linux	41s
client (gcc, g++, xdg-shell, Release)	1m 14s
docs	1m 29s
client (gcc, g++, xdg-shell, Debug)	59s
host-windows-native	1m 8s
client (gcc, g++, libdecor, Release)	1m 4s
module	18s
client (gcc, g++, libdecor, Debug)	56s
obs (gcc)	37s
client (clang, clang++, xdg-shell, Release)	1m 17s
obs (clang)	24s
client (clang, clang++, xdg-shell, Debug)	59s
client (clang, clang++, libdecor, Release)	1m 12s
client (clang, clang++, libdecor, Debug)	1m 19s
	14m 49s

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