Collections initialization proposal #1.

[mejackreed]

Pros: just keep using manifestId to initialize a miradorInstance
Cons: this starts to break down in some places and we have to end up
monkeypatching Manifesto. Other parts of the Mirador Window also make
other assumptions.

Update

After technical discussions this approach is preferred over #3250

Partially addresses #3248

[codecov-io]

Codecov Report

Merging #3249 into master will increase coverage by 0.13%.
The diff coverage is 61.90%.

@@            Coverage Diff             @@
##           master    #3249      +/-   ##
==========================================
+ Coverage   89.33%   89.47%   +0.13%     
==========================================
  Files         190      195       +5     
  Lines        3253     3600     +347     
==========================================
+ Hits         2906     3221     +315     
- Misses        347      379      +32     

Impacted Files	Coverage Δ
src/components/SelectCollection.js	0.00% <0.00%> (ø)
src/state/actions/action-types.js	100.00% <ø> (ø)
src/state/sagas/app.js	84.61% <ø> (ø)
src/state/actions/window.js	96.29% <50.00%> (-3.71%)	⬇️
src/components/CollectionDialog.js	60.86% <60.00%> (+4.11%)	⬆️
src/state/selectors/manifests.js	95.55% <66.66%> (-2.10%)	⬇️
src/components/PrimaryWindow.js	100.00% <100.00%> (ø)
src/state/reducers/windows.js	96.42% <100.00%> (+0.27%)	⬆️
src/state/sagas/windows.js	85.54% <100.00%> (+0.73%)	⬆️
src/state/reducers/accessTokens.js	77.27% <0.00%> (-14.40%)	⬇️
... and 24 more

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