dotbash_git: new module for git related bits

Needs some clean-up to be useful.
dotbash_tmux: make .tmux reload tmux conf as well
dormailrc: alias file for easier git send
i3/config: add scratch window support
dotbash_devqemu: clean-up mkdir -p setups
dotbash_zen: helper function to move stuff to disk
dotbash_zen: add some simple lttng helpers
exclude-builds-filter: add android build dirs
rsync filters: more optimisations

Also I use these filters for rsnapshot
dotbash_ccache: add basic ccache setting
dotbash_git: fixup prompt

I think I'm now ignoring the dirty/clean status which is useful but
potentially a time sync.