Support multi line separator

[goto1134]

Fixes #110

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 69.11%. Comparing base (9980790) to head (d6e30ce).
Report is 35 commits behind head on main.

Files	Patch %	Lines
...structurizr/dsl/psi/impl/SDAnimationBlockImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
+ Coverage   67.70%   69.11%   +1.40%     
==========================================
  Files          48       45       -3     
  Lines         703      654      -49     
  Branches      213      195      -18     
==========================================
- Hits          476      452      -24     
+ Misses         99       95       -4     
+ Partials      128      107      -21     

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[goto1134]

I don't think we need to cover this generated class with tests.

[goto1134]

@dirkgroot , what do you think about this change?

[dirkgroot]

@goto1134 I'm sorry for the delay. Unfortunately I currently don't have a lot of time available to review your PR. I'll try to take at look at this sometime in the upcoming 2 weeks.

[goto1134]

@dirkgroot , I rebased it to the master to make sure it is still working. Could you please take a look?

[dirkgroot]

Hi @goto1134, thanks for this contribution! I've been testing this, and I discovered that this change does not yet play well with the auto formatter.

This code:

workspace test {
    model {
        softwareSystem "System" \
            "Description"
    }
}

Results in the following code, after auto formatting:

workspace test {
    model {
        softwareSystem "System"
        "Description"
    }
}

As you can see, the \ is deleted and the "Description" string is not properly indented anymore.

[goto1134]

@dirkgroot do you think it's necessary to keep the line breaks after reformating, or should we drop them?