urlview_handler: No comma
overqemu: Move working directory from /tmp to /tmp/overqemu

Closes #11.
Add "choose"
choose: Fix page-wise scrolling
choose: Scroll half pages using ^F/^B
Add urlview2
im-urlchoice: Use urlview2
choose: Return current item if nothing is selected
choose: Auto-advance on select
choose: Add "v" to invert the selection
choose: Add "c" to clear the selection
choose: Add "g" and "G"
choose: Fix shebang, add list of keys
xib: Unify list of keys