version 1.0.21
Ensure that the errorWrapper is closed when a new document is opened (issue 4625)
Merge pull request #4628 from Snuffleupagus/issue-4625

Ensure that the errorWrapper is closed when a new document is opened (issue 4625)
Remove unused (local) variables in web/
Remove some unused variables from src/

Only obviously useless, local variables have been removed.
Merge pull request #4622 from yurydelendik/release1.0.21

version 1.0.21
Merge pull request #4607 from Rob--W/unused-vars-1

Remove a bunch of unused local variables from web/ and src/
Support for multi-line text layer

Adds a feature flag to support multi-line text layer. The main purpose is to
make text selection a bit more natural and to keep the DOM as leightweight
as possible by using as much as possible inline elements.
Get the font ascent of the font used in the text layer