Improved support for Docker

[lhstrh]

At times, it is necessary to run a command (e.g., to set environment variables) prior to building or when hitting the entry point. We add target properties to point to scripts for this purpose. We also add an option to skip the build step, in case integration into a more sophisticated build process is needed.

Related to #2232 in the sense that we need to check the handling across imported files etc.

• Add pre-build-script, post-build-script, and pre-run-script entries to docker target property dictionary
• Add builder-base and runner-base entries to docker target property dictionary to replace FROM
• Ensure that scripts are copied into the docker image
• Add no-build option (false by default) to skip the docker build step
• Fix paths referenced in compile definitions
• Perform builds for TypeScript target in docker container (not on host)
• Fix Files specified under the files target property should be included in the docker image #2278
• Docker support for C++ target #2322
• Let runner-base default to builder-base if specified
• Ensure tracing plugins work
• Ensure that pre-build-script is composed with app using &&
• Updated Docker docs lf-lang.github.io#267
• Add tests

[lhstrh]

@a-sr: The Epoch build fails because I introduced a dependency. Could you please push a fix to epoch? This is the dependency: https://commons.apache.org/proper/commons-text/dependency-info.html

I made a start and tried lf-lang/epoch#74 but it doesn't seem to work

[lhstrh]

@a-sr: The Epoch build fails because I introduced a dependency. Could you please push a fix to epoch? This is the dependency: https://commons.apache.org/proper/commons-text/dependency-info.html

I made a start and tried lf-lang/epoch#74 but it doesn't seem to work

Thanks for coming to the rescue, @a-sr!