API changes and adding DUT1

[cjordan]

@gsleap - would you mind reviewing, please?

From the changelog:

Unreleased

• Provide DUT1 in the metafits context.
• API tweaks surrounding generic types.
  • Things should be slightly more flexible than before.

[codecov[bot]]

Codecov Report

Merging #49 (2e880f6) into master (d3d404b) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   93.71%   93.79%   +0.08%     
==========================================
  Files          23       22       -1     
  Lines        5217     5188      -29     
==========================================
- Hits         4889     4866      -23     
+ Misses        328      322       -6     

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/convert/mod.rs	98.38% <100.00%> (ø)
src/correlator_context/mod.rs	98.24% <100.00%> (+0.02%)	:arrow_up:
src/ffi/mod.rs	90.76% <100.00%> (+0.01%)	:arrow_up:
src/metafits_context/mod.rs	93.96% <100.00%> (+0.02%)	:arrow_up:
src/voltage_context/mod.rs	94.54% <100.00%> (+0.05%)	:arrow_up:
build.rs

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[gsleap]

Looks good! Thanks for all the work, @cjordan !