Restructure of markup and overhaul of styling (Blazored#410)

* Initial rework of HTML with the addition of modal sizing

* Fixed broken test and added new ones for Size feature

* Fix for bubbling click events

* Moved to isolated CSS. Renamed CSS classes. Simplified animations.

* Fixed broken tests

Added Confirmed property to ModalResult and added payload to Cancelle…

…d ModalResult (Blazored#391)

Blazor native focus trap (Blazored#389)

Readme improvements (Blazored#282)

* Replace @Inject with [CascadingParameter] in readme
* Add 'or higher' to upgrade message
* Update information about using IE11

Bump ini from 1.3.5 to 1.3.8 in /src/Blazored.Modal (Blazored#268)

Bumps [ini](https://github.com/isaacs/ini) from 1.3.5 to 1.3.8.
- [Release notes](https://github.com/isaacs/ini/releases)
- [Commits](npm/ini@v1.3.5...v1.3.8)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chris Sainty <chrissainty@users.noreply.github.com>

 Added allowOutsideClick to be capture clicks outside the focus trap (B…

…lazored#226)

Focus traps are now deactivated when navigating from page (Blazored#213)

Removed ability to dismiss the modal using escape (Blazored#202)

Fixed extra content files being included in final package (Blazored#194)

Allows developers to customise the position of the modal (Blazored#193)

* Adds the ability to set the modal to a custom position

* Updated tests