move functionality to add line numbers to ly
encapsulate all HTML export functionality in ly.colorize.HtmlWriter
make css_item, css_attr, css_group simple toplevel functions
add linenumbers when printing source with line numbers enabled
bump ly to 0.3
release ly 0.3
fix #357, thanks for reporting
implement wishes in issue #357 and others: how html is styled is now configurable, and line numbers are not dependent on the current view setting. Also added is a way to copy HTML as plain text to the clipboard, so that it can be pasted in plaintext-only environments.
update the pot
Merge remote-tracking branch 'upstream/master'
midiinput: save keysignature setting; English key names