refactor main.c to win.c
introduce Term_Container
have a working Solo container
splits are back again
make Win a Term_Container
add term_next/prev/first/last
win: rename term->term to term->termio
top-level tabs
toggle tabbar
fix focus issue
the tab selector is back!
get add/hide buttons out of the toolbar
move split out of Term_Container
an arrow_up looks better to hide the tabbar
work on bell status
add option to hide top tab bar on launch
only show tabselector if tabcount > 1
late focus fix
tabs everywhere!
make tab-related keybindings work again