Added new --all-branches option

[qtzar]

Two new options have been added to the Generate Site command

--all-branches
--exclude-branches

This will allow the site builder to generate a site for every branch that is found in a remote repository and exclude any that have been explicitly named.

Not sure how to create a test for this, there doesn't seem to be any test for the existing site builder processes.

[dirkgroot]

Thanks for this useful addition! I've added 1 remark about the naming of the new arguments.

[qtzar]

@dirkgroot I've moved this to be a draft PR for the moment. I want to test to see what happens when if it hits a branch that does not build correctly or doesn't even have a workspace.dsl file and then do a little error trapping to skip those branches. I think this will provide a better experience.

[qtzar]

@dirkgroot I think I have a good solution for site generation using --all-branches where a branch may contain malformed DSL or even doesn't contain a DSL file at all.

My first thought was to just drop a try/catch around the diagram and site generator but this would result in the bad branches still being listed in the branch switcher dropdown. To get around this I had to loop the branches twice, first to generate the diagrams and detect the errors and then a second loop to generate the actual sites after the bad branches names had been removed from the lists of found branches.

[dirkgroot]

Thanks for the changes! I've added 2 suggestions to make the code more idiomatic and concise.

[qtzar]

Thanks for the code review. Kotlin is not my primary language so always good to learn a few new tricks.

[dirkgroot]

Looks good to me. Thanks for your contribution!