snapshot-129: MacVim Snapshot 129

Binary targets macOS 10.8+

- Vim patch 8.0.0502
- MacVim.app/Contents/bin now has mvim and other scripts for command line

Script interfaces have compatibility with these versions

- Lua 5.2
- Perl 5.16
- Python2 2.7
- Python3 3.6
- Ruby 2.0