Changed keybindings for stop loading.

The previous keybindings ctrl-c did not work, because this was caught as
escape sequence.
Use g_object_connect also for the webinspector events.
Added function to echo also if input is focused.

Removed none used vb_clear_input function.
Fixed wrong mode if no hints where found.

If hinting was started, but no hint was found, the input box was still
activated. Now we set the hint mode immediately in the hints_create function.
In the previous implementation the hinting mode was set in the command
function that didn't know if a hint where found or not and switched to hinting
mode also if no hint mas found.