Visual mode 'o' to switch end selection

[P4Cu]

Issue type:

• Feature request

Version:

Vimperator:	3.16.0 (created: 2017/02/01 00:55:15)
Firefox:	Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0

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Description:

When you enter caret mode then visual VIM supports pressing 'o' to switch to the other end of the selection so you can move beginning of selection.

Expected behavior:

Steps to reproduce: