Escape special characters in file paths when attaching files
Show error message when attaching file fails.
Merge pull request #277 from aurimasv/escape-path

Escape special characters in file paths when attaching files
Update submodules and versions
Fix cutoff of bottom of Search prefpane on Linux
Remove hardcoded prefwindow width
Fix Proxies prefpane
Mention Search pane in PDF tools message
Fix wide prefpane if PDF tools aren't installed
options.requestObserver callback for Zotero.HTTP.promise()

The callback receives the XMLHttpRequest object after the open() call.
Fix file sync error continuing to show after error had cleared
Make text in sync error panel selectable
Clarify WebDAV error messages
Fix positioning of sync error popup
Use latest csl-validator
Merge branch '4.0'

Conflicts:
	chrome/content/zotero/xpcom/zotero.js
	install.rdf
	update.rdf