implement a side window atm activable only via toggle-help and renders the defined keys. It's not focusable.

reorder cmd bindings, no functional changes

add cmd_move_tab and cmd_move_tab_to bound to `C-x t m'/`g M-t' and `C-x t M'/`g M-T' respectively, names lifted after the Emacs corrispectives

drop unused variable

[eecmd]: emulate emacs: stay in the minibuffer if no match

add backspace (keycode 127), for the linux tty linux ttys seems to send 127 on backspace, or at least do that under tmux. Educate telescope to treat 127 as del.

implement execute-extended-command

add y-or-n-p; ask user when encountering invalid certs

big refactor: introduce the window abstraction - commands now take a struct window* instead of a raw tab - the struct ui_state is gone - using a window for the minibuffer too helps avoid code duplication - it will let us having more than one window on a tab! :DD It doesn't seem to have broken anything...

fix cursor position on first draw and avoid unnecessary redraws

UTF8 input for the minibuffer!

[ui] read also non-ASCII codepoints

cursor handling with utf8 support the code relative to the cursors movements now respects the width of the characters (zero, one or two cells).

fix warnings

change default quote continuation prefix using "> " as prefix for both first and continuation lines was a bit ambiguous.