Add support for rendering a localized attribute

Introduce the playsinline attribute (#170)

Introduce the playsinline attribute

Make the type modifier of the orderedlist element accept the marker e…

Make the type modifier of the orderedlist element accept the marker enum

Make the loop attribute conditional

Add helper functions for markdown rendering (#155)

Replace the security struct with a feature flag

Extend the environment (#156)

Rename the method for the conditional statement

Tidy up a bit

Test the error reporting for the environment through the provider

Make string interpolation of a environment value possible

Make the sandbox modifier accept an enum (#167)

Assign the sandbox attribute to the inlineframe element

Make column element an empty node (#166)

Make the autocomplete modifier accept an enum (#165)

Remove the custom optionset again

Deprecate the old initializer

Deprecate the old modifier

Fix the incorrect tag for the variable element (#164)