git: add maintainer script and email info

When working on various OE/yocto repositories, update the sendmail information
to add identities for each. Also add a script which attempts to CC the
maintainers who might be interested/involved in the given patch.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
git: add identity for libopencm3

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
git: put identities together

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
git: switch push behaviour

Switch from 'simple' to 'current'.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
git: avoid CC'ing self

I find it a bit annoying that git CC's myself on emails.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
git: update ui colour control

Set to 'auto' (even though I think this was already in effect, make it
explicit just in case).

Signed-off-by: Trevor Woerner <twoerner@gmail.com>