fix: invalid import/regex

[ltdrdata]

fix: Changed to use relative imports

• The current import method causes import failures if the path name of a custom node changes (import failures occur when a new manager is introduced)

fix: Incorrect use of \ in regex strings

• From Python 3.12 onwards, using the \ character without explicitly using regex strings like r'\' is treated as a syntax error

[ltdrdata]

This is fixed.