Add tests for chapter 7

[ghost]

Add tests for chapter 7. It has missing tests for subsections 7.10.3 and 7.10.5.

[tgorochowik]

I see that besides the tests you included a test generator with a template - does it generate additional tests, or are these the same ones that you included directly?

Could this test generator be based on #43 ? Or could you take a look at #43 to see if you would do anything differently? I think we need some kind of a convention for the test generators (and a makefile target).

[ghost]

All tests are generated from basic7.sv template.

Generator can be adapted to fit #43 and basic7.sv template can be moved to e.g. conf/generators/template-basic7.sv

[ghost]

Pushed whole chapter-7 test suite.
It includes tests with $display functions for testing run time features like queues.
Run time features testing requires modification of scripts which should evaluate output of
run test.
At this moment are used two tags: :assert: and :re:. First one tests correctness of output. The second one expect specific output from tool e.g. full queue.

[tgorochowik]

@hzeller the tests here implement the features that could be used for testing simulation.

I think there is no point delaying this PR as these tests will still work just fine for syntax checking, so should be included in the report as soon as possible.

We still have to decide if we want to go this way (and adjust the runners to eval the :assert: and :re: and then modify the remaining tests to also do that where applicable)