sub: minor snippet update
Move stty commands to unix.bashrc and fix ctrl-q

Not sure why stty commands are only in cygwin (I guess ubuntu has better
defaults?)

Add stty -ixon so I can use C-q in terminal vim for block select.
Handle mingw in bashrc/aliases

mingw's uname doesn't support -o, so we're switching to -s. It seems to
provide the info I need. According to a post "Looking for "uname -a"
historical info" [1], OSX outputs Darwin. I tested GitHub for Windows'
version of mingw and Ubuntu directly. Hopefully cygwin works as
expected.

Oddly, I feel like I made this commit months ago and remembered finding
the link, but where did it go...

[1] https://discussions.apple.com/thread/4146972?tstart=0
Use both .git _and_ filelist as ctrlp root markers

I can use either one and ctrlp stops at the first one it finds.

Tested by creating a filelist in .vim/colors/ and invoking ctrlp from a
colorscheme (only shows contents of filelist) and from a ftdetect file
(whole repo).