Unify vi-mode visual state with lem buffer marks #1817
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Modified the visual states in vi mode to use lem buffer mark as starting point and initiator of visual mode regions. To support synchronisation some small additions to core lem implementation was needed, mainly hooks for enabling and disabling the buffer mark.
This allows activating visual mode from any of the "mark-xxx" commands available on emacs mode side, including mouse operations.
Vi states are now buffer specific, not global. This fixes several small glitches and annoyances when switching between windows and buffers
Closes #1590