snapshot-131: MacVim Snapshot 131

Binary targets macOS 10.8+

- Vim patch 8.0.0567
- Fix artifacts when entering full screen
- Fix flashing during window resizing

Script interfaces have compatibility with these versions

- Lua 5.2
- Perl 5.16
- Python2 2.7
- Python3 3.6.1
- Ruby 2.0