as role="menu" is a very specific (and strict) ARIA pattern for
desktop-like application menus, and our dropdowns are often used
as pure navigation dropdowns, this change abandons ARIA menus for
a more open-ended and light-weight approach
(see http://heydonworks.com/practical_aria_examples/#submenus and
http://www.w3.org/WAI/tutorials/menus/flyout/#improve-screen-reader-support-using-wai-aria)
note that in dropdown.js, switched to now target ``.dropdown-menu``
instead of ``role["menu"]`` - this also prevents bootstrap scripts
from "bleeding" into non-bootstrap components on the same page.
also removed the ``role=["listbox"]`` part, which appears to be
vestigial/unused (only place in bootstrap that uses that
role are carousels, and their key handling is done separately)

http://www.w3.org/TR/wai-aria/roles#separator

Clarify the bs-callout on multiple open modals

Update source maps link

Wall of Browser Bugs: Add link to "jQuery's browser bug workarounds"

[skip sauce]

Remove Firefox warning for customizer download.

Closes #15016.

Specifying both the type and URL is deprecated:
* https://docs.npmjs.com/files/package.json#license
* http://npm1k.org/

Closes #16517

[Close #16502] Clarify the bs-callout on multiple open modals

Currently it states overlapping modals, this isn't the only case as this truly applies to any instance when a user would want to open multiple modals at the same time. For this reason, I have modified the title of the callout to make this more clear.

Fixes Bootlint warnings:
	W007 Found one or more `<button>`s missing a `type` attribute.

[skip sauce]

[ci skip]

License header

Add a license header in theme instead.

Anchor.js 1.0.0 drops the need to use anchor.css, so we remove it
from the codebase and move any leftover styles over to docs.css.

Closes #16488 by merging it.

Fixes #16470
Closes #16483

[Close #16482] Add border-radius to theme's navbar-inverse

[Close #16482] Add border-radius to theme's navbar-inverse

Document that nested tabs are not supported

Tweak temporal inputs

Redo jumbotron padding

- In general, there are very few instances that would require a jumbotron without a parent or child container.
- Right now we account for that behavior though with some horizontal padding on the .jumbotron class.
- This removes that horizontal padding as it narrows our grid classes unnecessarily and accounts for a super small use case.
- It also improves consistency across breakpoints, in that padding isn't being added and removed.
- In doing so, I also removed the shorthand padding property and went with the specific ones (because yay specificity).

Add Wall of Browser Bugs entries for #15998

Closes #15998
[skip sauce]

[skip sauce]
[skip validator]

Remove unnecessary style=flat from badges

Adds button styles to `.list-group-item`

Fixes Issue #16371 Carousel control is vertically off center

[Closes #16460] Fix .pagination-sm line height

[Closes #16447] Manually add license to bootstrap.less