Merge Reshape traits.

[Anders429]

Similar to #210, this simply replaces the various Reshape traits with a generic Reshape trait.

This, like Get, turned out to be pretty easy because it's a fundamental operation that was defined nearly exactly the same each time. It turns out reshaping is not done as much as extraction through Get, but I anticipate it could be used more in the future as more features are built into the library.

[codecov]

Codecov Report

Merging #211 (ead3472) into dev (567b985) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #211      +/-   ##
==========================================
- Coverage   96.94%   96.94%   -0.01%     
==========================================
  Files          86       85       -1     
  Lines       14009    14000       -9     
==========================================
- Hits        13581    13572       -9     
  Misses        428      428              

Impacted Files	Coverage Δ
src/hlist/mod.rs	98.18% <ø> (ø)
src/query/result/iter.rs	98.66% <ø> (ø)
src/query/result/par_iter.rs	83.14% <ø> (ø)
src/registry/contains/par_views/sealed.rs	100.00% <ø> (ø)
src/world/entry.rs	96.02% <ø> (ø)
src/archetype/mod.rs	98.05% <100.00%> (-0.02%)	⬇️
src/hlist/reshape.rs	100.00% <100.00%> (ø)
src/query/entries.rs	100.00% <100.00%> (ø)
src/registry/contains/views/sealed.rs	97.85% <100.00%> (-0.15%)	⬇️

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