my-c-mode: add more complete qemu style from pmm
my-yasnippet.el: add helper function for email

This is the start of a semi-smart email expansion for various git tags.
I can expand this later for other stuff.
my-git.el: fix setting of git commit popup
init.el: set default-frame-alist for full-screen.

Seeing as I'm either in i3 or ChromeOS this should be the default.
my-email.el: flycheck fixes.