the existing function calls in place for backward compatibility. They
now call the new functions in the string library
lib/dtutils.string - Moved the filename/path/extension string functions to the string library
to prevent a circular library depnedency. The file library includes the
string library. If the string library needed to manipulate filename
related strings then the string library would need to include the
file library which would lead to a stack overflow.
strings of lua "magic" characters before using the string in a string
function that involves matching.
script_manager needs the path to the lua directory sanitized of lua
"magic" characters to prevent failure to extract the category and script
names.
