vim overrides the terminal color scheme

[Tyriar]

Integrated terminal master issue: #143

Steps to Reproduce:

1. Toggle terminal
2. Launch vim (color scheme changes)
3. Exit vim (vim's changed color scheme remains)

[romgrk]

I might be wrong, but from what I recall/understood from recent discussions in neovim:

• In some terminal emulators, the colors can be set by the program; however, there can be at most n colors, where n is usually 16 or 256.
• Some vim colorschemes take advantage of this to approximate #RRGGBB colors, by mapping colors to terminal color-codes [0-255].
• Vim is supposed to save the colors from termcap/terminfo upon entering, and restore them upon leaving.

[Tyriar]

This is fixed in latest, likely to do with colors 16-255 not being defined previously.