Builds a Ubuntu image with all the tools

[jbemmel]

Dockerfile to build a container with all the tools

[rmanohar]

Thanks for doing this! I'll test this and merge shortly. If you are planning on some additions, let me know and I'll hold off for a week or so.

[jbemmel]

irsim builds ok, had to remove docker installed by 'snap' and replace with regular install to make X11 socket passing work