#393 Variable replacement in code inserts

[David Schwingenschlögl]

I'm talking about the inserts that are customizable for
the list in Edit > Insert.

Would be nice if it would be possible to be able to
have some (predefined) variables that get replaced upon
insertion, such as %DATE% or %FILENAME%.

-- Example snippet: --
/
* filename: %FILENAME%
* created on: %DATE% %TIME%
* ...
/