Command+L when in url bar with URL bar suggestion should select full URL

[bbondy]

There was also a lot of other fixes which moves things out of the
component and into the store.

Note that there are no state functions in use yet for the window
renderer so I didn't create them yet as part of this task and just
used immutableJS directly.

I also fixed some intermittents with this fix.

Fix #9914

Auditors: @bsclifton

Test Plan:

1. Fully test url bar and suggestions thoroughly
2. Type in some chars that lead to a autocomplete selection, press
   command+L and make sure it selects all text.

Automated test plan

npm run test -- --grep="selects full url when autocompleting with partial selection"

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[bbondy]

I think this is done just marking as WIP until I see if tests pass on Travis, they pass locally.

[bbondy]

Ready for review pls.

[bsclifton]

Changes look good and work as expected 😄

[bsclifton]

@bbondy I merged but am having trouble cherry-picking into 0.19.x. Can you help?

[bbondy]

confirming this is in 0.19.x