xdg desktop directory for anbox category

Add host directory bind mount support in anbox.

cmake: Use FindGMock from cmake-extras

Add "rootless window mode"

Improve performance

This adds rootless mode, in this mode a window wont be created until a
application is started.

Since we already require cmake-extras to build both docker and snap, lets
use FindGMock from there also.

For the amount these functions get called, std copy is way to expensive
to do. This removes the need for buffer to be copied twice, first to a
std::vector then SmallFixedVector. This also directly copies buffer into
a smallVector without the init overhead smallVector's ctor do. This
result is a massive performance bootst (at least on arm devices).

Also use memcpy since that interestingly seems to be faster on arm
devices, on amd64 they seems to be about the same speed.

	Uses bindtab file in anbox data directory to bind directory from host to anbox container.
	Resolve #1754.

ignore directory .vscode

Do break out of while loop

snapcraft buildtime image handling fixes

add config item: lxc.prlimit.nice

remove unused parameter Runtime

Refactor namespace declarations

remove PendingCallCache from ManagementApiSkeleton