fix start_sdk.sh, add test cases, rename TODO and CHANGELOG, add changelog for v0.99.22
reorder changelog file
NEW: add option to Add-on preferences to exclude user-defined URLs from hyperlink scanning
show if page is ignored:

hyperlink-scanner: emit event if page is ignored
main: forward event to toolbar-panel via widgetMain
toolbar-panel: adapt GUI to show if page is ignored
show if page is ignored: do not show when scanning disabled / fix version display
changelog
update TODO