add(adapter) heads up display view

[chrisgervang]

Useful for adding data-driven widgets on top of map animations.

• map scale legend
• data legend
• info visualization
• raw data readout

Changelog

1. new DeckAdapter({headsUpDisplay: true})
2. Add deck layers with an id containing %%hud (i.e. %%hud-map-scale-widget)

data-driven-text.mp4

Related

• Implement OrthographicView keyframes #195
• Merge fix(mapbox) leave additional views intact deck.gl#6329

[coveralls]

Pull Request Test Coverage Report for Build 1428454222

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 13 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.5%) to 25.497%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
modules/core/src/adapters/deck-adapter.js	0	13	0.0%

Files with Coverage Reduction	New Missed Lines	%
modules/core/src/adapters/deck-adapter.js	1	0.0%

Totals
Change from base Build 1388070915:	-0.5%
Covered Lines:	231
Relevant Lines:	786

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💛 - Coveralls