Add a modal Dialog component (#245)

* Create src/Dialog.ts and test

* Add stories

* Center the anchor

* Fix buttons, colors

* Fix buttons in Sprite stories

* Rename to DialogSolidColors, remove the logs

* Use Texture.WHITE as default backdrop, make dialog buttons optional, add 2 stories

* Modify createBunnyBackdrop to display a scrolling grid of bunnies

* Remove NineSliceDifferentSizes story, move createBunnyBackdrop and give it a scrollSpeed param

* Add new backdrop.ts file and JSdoc comments

* Use scroll box for the letter grid

* Fix checkbox hit area by adding fill()

* Reduce the height

* Add getters, rename properties - to match the established style of the other components

* Add disable animations property

* Update user stories

* Drop disableAnimations and use animations like FancyButton

* Update the ConfirmDialog story to use FancyButtons

* Make the FancyButtons in the ConfirmDialog story fancier

* make padding to be applied horizontally

* make padding do not effect content margings

* use closeOnBackdropClick setting in all stories if present

* fix defaultButtonHoverColor & defaultButtonPressedColor can be 0

* refactor Dialog buttons

* Fix the closeOnBackdropClick bug when dialog body is clicked

* Remove the animated bunny backdrop

* Remove the solid colors dialog

* Fix letter alignment

* Add margin between buttons

* Add spacing between non-fancy buttons

* fix rest of the issues and update content implementation

* fix issue

* Fix warnings

* Fix closing the 'Use Sprite' dialogs

* fix story

* add onClose event

* update docs

* fix issues

* fix lint

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Co-authored-by: Dmytro Soldatov <cyberdexx@gmail.com>

Author: afarber

src/Dialog.ts

@@ -1,6 +1,7 @@
 export * from './Button';
 export * from './CheckBox';
 export * from './CircularProgressBar';
+export * from './Dialog';
 export * from './DoubleSlider';
 export * from './FancyButton';
 export * from './Input';