added waylandcompositor plugin deployer

[SushiTee]

I added a class to deploy the following 3 plugin directories:

• wayland-decoration-client
• wayland-graphics-integration-client
• wayland-shell-integration

when the plugin waylandcompositor is selected.

I confirmed my specific app working with wayland like this. Here are the environment variables I set:

export EXTRA_QT_PLUGINS="waylandcompositor"
export EXTRA_PLATFORM_PLUGINS="libqwayland-egl.so;libqwayland-generic.so"