using 'gemini-page-theme' class some elements of the rendered page
(header prefix, bullet and so on) can be customized.
users can use configuration files directive to change the appearance of said elements
(both character and color or font variants);
- removed unused argument from command line switch: '-m'.
- renamed function: 'text-utils:left-padding-suffix' to 'text-utils:left-padding-prefix';
- rendered the choice index for poll's choicehs;
- shown if a poll allows multiple choiches.
- prevented an info or error message on the command line to overlap
with prompt when asking for user input and, in particular, when
asking for message attachment.
- prevented crash when trying to expand a null string;
- clear send-message-window before deleteing an attach from the list;
- added an info when a status is ready to be sent;
- using a stack to sort drawing order of windows.
