v1.2

Release version 1.2

Changelog

	Fix: enable downloading PDF after document error
	Fix: [mv3] remove native viewer in new Chrome(iums)
	Fix: [mv3] persist context-menu state across updates
	New: [mv3] option to bypass built-in/other viewers
	New: option to automatically track PDF outline
	New: enable comment and sign annotation editors
	Improve: detect MV2 in options page using manifest
	Improve: update MV2 popup to not use executeScript
	Update: doq, PDF.js to v6.0, metadata and README