Allow `Entry` access from system run method.

[Anders429]

Fixes #191.

This fix is basically what I described in the issue. By changing the query::Entry bounds to no longer require SubViews and Filter to be contained directly in the Registry, we are able to define proper trait bounds on System::run() (and ParSystem::run()) to allow the access for any generic Registry.

[codecov[bot]]

Codecov Report

Merging #195 (ff6295a) into dev (d446c75) will increase coverage by 0.13%. The diff coverage is 98.28%.

@@            Coverage Diff             @@
##              dev     #195      +/-   ##
==========================================
+ Coverage   94.72%   94.85%   +0.13%     
==========================================
  Files          88       89       +1     
  Lines       14186    15477    +1291     
==========================================
+ Hits        13437    14681    +1244     
- Misses        749      796      +47     

Impacted Files	Coverage Δ
src/system/schedule/scheduler.rs	100.00% <ø> (ø)
src/system/schedule/sealed.rs	100.00% <ø> (ø)
src/system/schedule/stager.rs	100.00% <ø> (ø)
src/system/schedule/stages.rs	100.00% <ø> (ø)
src/system/schedule/task/sealed.rs	100.00% <ø> (ø)
src/system/schedule/mod.rs	75.74% <76.78%> (-0.37%)	:arrow_down:
src/archetype/mod.rs	98.07% <100.00%> (+0.11%)	:arrow_up:
src/query/entries.rs	100.00% <100.00%> (ø)
src/query/view/contains/filter.rs	100.00% <100.00%> (ø)
src/query/view/get.rs	95.60% <100.00%> (-4.40%)	:arrow_down:
... and 6 more

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