* Add SwiftyMarkdown swift module.
* Fix a bug in dropExcessLinesWithWidth where cursor_rawline was not adjusted.
* Make appendContentsOfLineBuffer optionally transfer the cursor position and return the number of lines dropped.
* Fix a bug where shift-arrow events to enter copy mode were handled twice.
* Fix a crash when selection promises are nil, which can happen after a session is closed.
* Fix a bug where SetDecodedImage called invalidateRestorableState on the wrong thread.
* Give ScreenCharArray the ability to (de)serialize
* Fix a bug where VT100GridRange.dirtyRangeForLine: didn't respsect allDirty.
* Add VT100GridCoordRangeInvalid
* Fix a bug when synchronizing while state is shared that screwed up line buffers because the serach buffer tries to merge from the immuatable state's line buffer
* Lots of fixes to how line buffer positions are converted to coordinates to deal with bugs around empty lines. This probably broke things.
* Fix an apparent off-by-one in hideOnScreenNotesAndTrun...