fix: evaluateSteps after each submodule

[fwereade]

Description

• does post-submodule evaluation after each submodule, to handle indirect dependencies (with test)
• bases re-evaluation decision on whether input state has changed (because output state is handled by the above)
• no longer double-counts the initial evaluateSteps and expandBlockses in parseDuration

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[nikpivkin]

We have to do the evaluation after expanding the blocks and evaluating the submodules (See the failed test).

[fwereade]

…ah, dammit, yes – sometimes there are no submodules

[nikpivkin]

LGTM!