init.el: add support for god-mode

This doesn't seem to work with tracking-mode's C-c C-SPC but it does
make the C-c C-@ simpler as c@.
snippets: add disasfn to snippets

I should make this QEMU specific.
init.el: disable <escape> toggling for god-mode

Too many conflicts.
qemu-arm-disas: add condition to snippet
my-git.el: ensure GIT_EMAIL right at work
my-git.el: add my checkpatch aware script