patch 8.0.1558: no right-click menu in a terminal commit https://github.com/vim/vim/commit/aef8c3da2ba59285b7cfde559ae21cdce6ba6919 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 3 18:59:16 2018 +0100 patch 8.0.1558: no right-click menu in a terminal Problem: No right-click menu in a terminal. Solution: Implement the right click menu for the terminal.

This is a MODIFIED version of libvterm.

The original can be found:
- on the original site (tar archive and Bazaar repository):
	http://www.leonerd.org.uk/code/libvterm/
- cloned on Github:
	https://github.com/neovim/libvterm

Modifications:
- Add a .gitignore file.
- Convert from C99 to C90.
- Other changes to support embedding in Vim.