…tepper branch. (#5742)

* Prototyping

* Further work

* Further prototyping

* Further prototyping

* Further work

* Adding event emitters

* Adding "selectedIndex" attribute to stepper and working on TemplateOulet.

* Prototyping

* Further work

* Further prototyping

* Further prototyping

* Further work

* Adding event emitters

* Template rendering and selectIndex control done.

* Work in progress for accessibility

* Added functionalities based on the tentative API doc.

* Refactor code for cdk-stepper and cdk-step

* Add support for templated label

* Added support for keyboard events and focus changes for accessibility.

* Updated vertical stepper + added comments

* Fix package-lock.json

* Fix indention

* Changes made based on the review

* Changes based on review - event properties, selectors, SPACE support, etc. + demo

* Add select() for step component + refactor to avoid circular dependency + support cycling using arrow keys

* API change based on review

* Minor code clean up based on review.

* Several name changes, etc based on review

* Add to compatibility mode list and refactor to avoid circular dependency

feat(stepper): Create stepper button directives to enable adding buttons to stepper (#5951)

* Create stepper button directives to enable adding buttons to stepper

* Changes made based on review

* Minor changes with click handlers

Build changes

feat(stepper): Add initial styles to stepper based on Material guidelines (#6242)

* Add initial styles to stepper based on Material guidelines

* Fix flex-shrink and min-width

* Changes made based on review

* Fix alignment

* Margin modifications

feat(stepper): Add support for linear stepper (#6116)

* Add form controls and custom error state matcher

* Modify form controls for stepper-demo and add custom validator

* Move custom step validation function so that users can simply import and use

* Implement @input() stepControl for each step

* Add linear attribute to stepper

* Add enabling/disabling linear state of demo

feat(stepper): Add animation to stepper (#6361)

* Add animation

* Implement Angular animation

* Clean up unnecessary code

* Generalize animation so that vertical and horizontal steppers can use the same function

Rebase onto upstream/master

feat(stepper): Add unit tests for stepper (#6428)

* Add unit tests for stepper

* Changes made based on review

* More changes based on review

feat(stepper): Add support for linear stepper #2 - each step as its own form. (#6117)

* Add form control - consider each step as its own form group

* Comment edits

* Add 'valid' to MdStep for form validation

* Add [stepControl] to each step based on merging

* Changes based on review

Fix focus logic and CSS changes (#6507)

feat(stepper): Add documentation for stepper (#6533)

* Documentation for stepper

* Revision based on review + add accessibility section

feat(stepper): Support additional properties for step (#6509)

* Additional properties for step

* Unit tests

* Code changes based on review + test name changes

* Refactor code for shared functionality between vertical and horizontal stepper

* Refactor md-step-header and md-step-content + optional step change

* Simplify code based on review

* Changes to step-header based on review

* Minor changes

Fix host style and demo page (#6592)

Revert package.json and package-lock.json

Changes made along with BUILD changes in google3

Add typography mixin

Changes to address aot compiler failures

fix rtl bugs