FSWitch vim plugin

For switching between .c/.cpp and .h
git rv alias rename detection
Update gitbashprompt submodule
Update vim-fswitch github url

Add .git for consistency.
Add android tab keyevent alias
Add fixagent alias to fix ssh-agent env variables

ssh-agent is often broken when ssh-agent is killed or when tmux is
reattached.

Find the right variable values to use and set them.