Revise some attributes (#223)

* Revise the download attribute

* Revise the hidden attribute

* Revise the relationship attribute

* Introduce the imagesources attribute

* Introduce the imagesizes attribute

* Rename the sourceset attribute

Make progress on the components (#206)

* Tidy up a bit

* Fix missing prompt in datepicker component

* Consolidate the border modifiers

* Rename the backgroundcolor modifier

* Tidy up a bit

* Fix some css

* Make use of the recent changes in htmlkit

* Utilize css nesting

* Update copyright notation

* Improve the accessibility

* Provide accessibility modifiers

* Add identifiable conformance to pane component

* Let htmlkit handle the escaping

Revise some attributes (#207)

* Revise the drag attribute

* Mark older deprecations as unavailable

* Revise the edit attribute

* Revise the spellcheck attribute

* Revise the translate attribute

* Make the label attribute localizable

* Revise the open attribute

* Revise the headers attribute

* Mark older deprecations as unavailable

* Fix failing test

* Consolidate fill attributes

* Revise the enterkey attribute

* Consolidate popovertarget attributes

* Consolidate shape attributes

* Consolidate stroke attributes

* Tidy up a bit

Tidy up some code (#199)

* Fix misspelled readonly attribute

* Remove redundant lines by leveraging default parameter

* Extend correct protocol

* Fix some oversights in the code

* Add the root property to editorconfig

* Fix some code examples

Support unescaped html (#181)

* Introduce htmlstring to support unescaped html

* Make the comments more explicit

Make localization errors non-fatal (#175)

* Limit localization tests to localization logic only

* Try to recover when requested locale is not available

* Handle all the remaining errors gracefully

* Refactor a bit

* Test the recovery of an unknown table

* Handle cascading errors

* Clear the environment locale after it cannot be found

Introduce the playsinline attribute (#170)

Fix localization fallback behaviour (#163)

* Check if localization is properly configured

* Test the error reporting for localization through the provider

* Prevent the default locale from being overwritten

Revise the component plugin (#147)

* Revise the component plugin

Add a more convenient way to deploy the files to the public directory of Vapor.

* Update the documentation

Prepare for release (#145)

* Make the features flag available to vapor

* Tidy up a bit

* Silence deprecation warning of nsdictionary

* Update readme

* Silence warning of shadowing type parameters