completing_read: take tab pointer instead of id

typo + fmt

factorize place_cursor

simplify minibuffer/echoarea redraw split the logic into two functions: one to render the echoarea and one to rendere the minibuffer (when it's active).

move utf8 decl. to utf8.h

move ui decl. to ui.h

move declarations to minibuffer.h

move minibuffer-related fns to their own file and a bit of foreshadowing... :)

rename minibuf to echoarea there's a close relationship between the echoarea and the minibuffer, but let's call it echoarea for now.

initialize the keys before reading the configuration

move the argv handling back into the main()

bugfix: print the trailing face until the right column This would leave the last column white if !olivetti-mode and a background color for some body lines

fix two related bug Don't crash when there's a certificate mismatch and after saving the cert, before choosing to persist it, the page gets redirected; also, don't repeat the "Certificate mismatch" after the first yes, if there's a redirect. Now when the user accept a certificate, is treated as temporary saved for the whole session.

fix top_line/current_line wrt L_HIDDEN this fixes some infinite loops that may happen if the first line is hidden, or things happens. The idea is to move the line forward/backward until a non-hidden one is found.

add support for hidden lines; push-button now toggle pre blocks