Spinner, Range Inputs and various fixes

• fix: Dropdown only shown dropped once. Surfaced first in later version of chrome.
• added: Spinner module for easily creating (css only) spinners. Example (Note: Need to use at least Bootstrap 4.2/4.3 css)
• added: Range input/slider. Tx to @Munksgaard for contributions. A simple example here
• added: Support for custom labels in Radio and Checkbox
• added: Scrollable body and custom attributes to Modal
• fix: Expose centered option for Modal
• added: Add support for plaintext input
• added: submitButton and resetButton shorthand functions to Button module
• update: CDN module now points to Bootstrap 4.3.1 css.
• minor: Some doc fixes. tx to contributors for issues and PRs here!

5.1.0

• added: customListGroup to Cards
• added: Option to add custom attributes to form groups
• fix: Temp fix for dreaded Map! for popovers in debug mode
• internal: re-enable elm-test that now support Html tests

Upgrade to Elm 0.19

This release brings Elm Bootstrap support for Elm 0.19. There is no plan to continue supporting an Elm 0.18 compatible version of Elm Bootstrap

Breaking changes:

• Due to the removal/not upgrading elm/color, avh4/elm-color is used in darkCustom and lightCustom in the Navbar module
• defaultValue has been removed from Form related modules.

Potentially breaking behaviour/styling:

• Due to elm-browser always capturing clicks on a tags and no way to disable this:
  • Accordion uses a button with a btn-link class rather than a a element for the header/toggle
  • Tabs uses buttons with a btn-link class unless useHash is set to True, then an a tag is used and you can support deep-linking and/or custom behaviour (commands, update model etc) on tab changes through hooking into the navigation messages in elm-browser application.