feat: text-objects and working swap

[benlubas]

The rebirth of the manoeuvre module, and the death of that awful (to spell) name.

• Rips the swap_node function from nivm-treesitter/nvim-treesitter's ts_utils and fixes the way it handles trailing blank lines
• Changed text object names to be more normal (ie. around-heading -> heading.outer)
• update the roadmap to reflect that this work is done

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Text object ranges are kinda bad right now. They select onto the line of the next heading.. probably just an off by one, I'll correct that.

This might be fine the way it is. it's just including the last newline in the selection, I think that it looks weird, but it's not he end of the world. Would want to see your thoughts.

[vhyrro]

Works well for me, thank you!