[dfmc-reader] Remove unused <template-closure>

This was marked for removal in 1997. Safe now.
Merge pull request #672 from dylan-lang/remove-template-closure

[dfmc-reader] Remove unused <template-closure>
[doc,c-ffi] Fix formatting errors.
Bump testworks submodule to include benchmarks.
[doc] Formatting: Add bullet lists.
[doc] Add release note for testworks benchmarks.
Bump strings submodule.
Merge pull request #675 from cgay/relnotes

Release notes updates
[doc,duim] Fix a variety of formatting issues.
[doc,duim] Fix extra space before periods.
[doc,io] Fix typo.
Make *-test-suite-app libraries live with the sources they test.
Merge pull request #677 from cgay/qa

Make *-test-suite-app libraries live with the sources they test.
Bump testworks submodule to get allocation output.
Implementation of DEP-0007, less compatibility changes.
Implementation of DEP-0007, with compatibility changes.
Collections test suite was incorrect for “element”: the return value does not need to be the element type of the collection if “default:” is used.
Collections test suite was too strict with add! and remove!: OD implements them on <collection>, not just <sequence>.
Implementation of DEP-0007 that works with existing (modified) tests and repeated slots. “-with-fill” classes removed.
More correct array handling in library code.
Corrected implementation of “element” to allow element-not-found default of different class than element type.
Removed default value for “default-fill:” keyword argument to “limited”. Neither the DRM nor the DEP calls for it.
Fixes shadowing definition of element-type and element-type-fill.
Correctly initializes element-type-fill of concrete limited collection classes.
Fixes <stretchy-vector> resizing to employ the element-type-fill when increasing collection size.
Creating limited <string> results in limited <byte-string>.
Removed redundant code.
Added tests.
Documentation.