bin: helper scripts worth keeping with dotfiles
dottmate: add tmate specific config

This helps with nesting tmux inside tmate sessions.
dotbash_tmux: helper functions for tmate
dotbash_ps1: add env flags for ARCH and CROSS_COMPILE

As i use these a lot it's useful to see if they are set in my prompt.
setup_dotfiles: also create out ~/bin and set it up
dotmbsyncrc: update for latest, add sub-fetch types
dottmate: add some more useful bindings
dotmailrc: more tweaks for the guest debug patches
dottmux: add "l" and "p" actions

 - l, set up a netcat listening to port N
 - p, save tmux buffer into xsel paste bufffer

Also tweak set-titles-string to show host/command on window title.