fix various warnings, no functional changes now that we have a bounch of -Wxxx flags during compilation, let's fix everything.

ability to add page to bookmarks!

don't print -mode after the parser name

start loading animation after cmd_{previous,next}_page

refactoring + move wrapping logic to its own file

wrap struct line into vlines

first draft of history system is here

refactor minibuf_hist stuff into more general hist/histhead

show page title in tabs

drop useless struct declaration

move keymap funcs in its own file

avoid unnecessary wmove

display the current keychord in the minibuffer if empty

use werase instead of wclear to erase a window content

don't crash if cmd_push_button over the last line