Log Message:
swirc: update to 3.4.4.

## [3.4.4] - 2023-07-29 ##
- **Added** a man page that describes how to write themes.
- **Added** and made use of a pointer validation function.
- **Added** improved unicode support in the **printtext** and **readline** modules.
- **Added** usage of a binary search algorithm.
- **Added** validation of nicknames before they go into the names hash
  table.
- **Allowed** the names htbl modify API to alter names even if the list is
  incomplete. (But only in ICB mode.)
- **Changed** the file suffix for theme files from `.the` to
  `.thm`. (`.the` looks too much like the English word "the".)
- **Closed** an open stream before exit
- **Defined** noreturn for C++ in `fallbackattrs.h`
- **Fixed** hardcoded function names in error messages
- **Fixed** unchecked return values
- And more...