1.4.6 Bugfix release

There some REALLY unfortunate bugs in 1.4.5 (which were present even earlier) that I didn't notice. So here is the release where I fix them.

Changelog:

• Replace potentially problematic (caused segfault when compiled with _FORTIFY_SOURCE) time_s::fmt_sprintf with time_s::fmt_str
• Update cmd::retval (command return value) after every command
• Update cui::status (program status line) after with every return value that is not empty
• Codebase: file naming changes, with errors caused by it fixed