Support new features of Tizen.CircularUI (#188)

Support new features of Tizen.CircularUI (#188)

* Use Forms's GetHandler (#228)

* Fix ActionButton geometry calculation (#237)

* Fix the issue that text and bg color in PopupEntry is not changed while edit text (#239)

* Fix issue of unsupporting special character in Bottom button (#244)

* Fix issue that newline and ampersand are not supported in Information&TwoButton Popup (#250)

* Adds CircleSurfaceView (#258)

* Merge branch 'circular-shell' (#264)

* Add appium test for CircularShell (#241)

* Add Appium unit testcase

* Update Shell UI Tests (#236)

Co-authored-by: shmin <shmin.dev@gmail.com>
* Update Icon Images (#245)

* Update WearableUIGallery to use Shell (#252)

* Fix TwoButtonPage issue on shell (#255)

Co-authored-by: shyun.min <shyun.min@samsung.com>
Co-authored-by: Seungkeun Lee <sngn.lee@samsung.com>
Co-authored-by: shmin <shmin.dev@gmail.com>
Co-authored-by: shyun.min <shyun.min@samsung.com>
* Add new ContentButton (#263)

* Add new ContentButton

* Change Renderer inheritance and fix typo

* Restructure ContentButton and ContentButtonRenderer

* Fix layout issue

* Remove OnLayoutUpdate method

* Fix typo

* Support the CircularShell

This commit refers to these commits

* Update CircularShell (#229)

* Update X.Forms version to 4.4.0.991537 (#227)

* Add CircularShell (#226)

by Seungkeun Lee <sngn.lee@samsung.com>, shmin <shmin.dev@gmail.com>, Kangho Hur <rookiejava+github@gmail.com>

* Fixed the invalid resource stream