fixed handling of the IS_SANITIZE_ENABLED preference
fixed some amo validation warnings
fixed command updater for save message as note command in TB and some bugs
codemirror updated to version 4.2
fixed bug that unregisters notebooks after update to 0.9.21added support for multi-selection in source editor
fixed multi-selection issues in html editor
added clipper's stylesheet options
added support save the stylesheets in different ways and the appropriate settings
added confirmation to save changes on exit to options window
added info-window opened when the version number changed
added processing local links
fixed processing of local links for sanitize mode (TB)
fixed .gitignore