updates to connector and add first/last for composites

[lrennels]

No description provided.

[codecov]

Codecov Report

Merging #798 (c92ea15) into master (9ba6c74) will increase coverage by 0.21%.
The diff coverage is 98.14%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   80.37%   80.59%   +0.21%     
==========================================
  Files          37       37              
  Lines        3053     3066      +13     
==========================================
+ Hits         2454     2471      +17     
+ Misses        599      595       -4     

Flag	Coverage Δ
unittests	80.59% <98.14%> (+0.21%)	⬆️

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Impacted Files	Coverage Δ
src/core/paths.jl	80.28% <ø> (ø)
src/core/connections.jl	87.11% <93.75%> (+0.23%)	⬆️
src/core/build.jl	100.00% <100.00%> (ø)
src/core/defcomposite.jl	90.17% <100.00%> (+0.65%)	⬆️
src/core/defs.jl	86.07% <100.00%> (+1.50%)	⬆️
src/core/dimensions.jl	84.21% <100.00%> (ø)
src/core/model.jl	84.21% <100.00%> (ø)
src/core/types/params.jl	61.90% <100.00%> (ø)
src/core/defcomp.jl	81.28% <0.00%> (-0.59%)	⬇️

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