add miniview feature to terminology.

Pressing ctrl+shift+f toggles miniview on the side of each terminal/split/tab
miniview: cleanup
add miniview_init/shutdown
add termio_pty_get()
miniview: use an image ftm
miniview: fill the image from backlog
miniview: have ctrl-shift-h toggle the miniview
miniview: also draw current screen
miniview: scroll with mouse wheel
add tools/banner.sh to help debug miniview
miniview: handle redrawing when scrolling
miniview: correctly handle resizing
miniview: toggle miniview from miniview
miniview: have only one buffer
miniview: deferred rendering
miniview: click on it to scroll to that position
miniview: fix with splits
miniview: display correct colors
miniview: use edje
miniview: close from edj