KanbanMD update

I've updated kanban md with a few fixes to make it nicer to use every day.

• Right click actions have been added to the tabs, lists and cards
• Much nicer behavior on paste, and you can force copied sections to be pasted as cards with ctrl + shift + v
• Added the prevent default plugin to disable some shortcuts
• Focus the next card after archiving one
• Detect and close files that have been deleted or removed
• Option to open a file with the default system text editor
• More predictable undo/redo behavior, and keeps the scroll postion
• [escape] clears the search even if that input is not focused
• Remove the "duplicate" shortcut with "d" that was too easy to trigger accidentally, and not super useful
• generate a sync conflict file if the local file is not in expected state when trying to overwrite it
• check if the file changed after a long time of inactivity

This makes the app much nicer to use for me. You can get it here for linux : https://kanbanmd.lecaro.me/