Allow to run Vim, Neovim and SpaceVim
Summary:
SpaceVim is a distribution of plugins for Vim and Neovim.
The final installation is to be done at user level, but there are some
preparation we can automate in config:
- install neovim and Python support
- ensure tmux supports true colors
Ref T295
Test Plan: nvim on WindRiver, then install Spacevim
Reviewers: dereckson
Reviewed By: dereckson
Maniphest Tasks: T295
Differential Revision: https://devcentral.nasqueron.org/D2647