Refactor module paths and enhance grapple robustness

- Standardizes module import paths across grapple gun scripts by removing the "Base.rte." prefix.
- Improves grapple stability by adding checks to ensure the parent entity is a valid actor with a controller before performing updates, preventing potential errors.
- Corrects Lua comparison operator from `!=` to `~=` for proper syntax.
- Fixes logic for determining rope break conditions when under high tension.
- Adjusts the conditions under which the rope tension indicator is displayed.
- Introduces new, currently unused, rope physics functions in `RopePhysics.lua` as groundwork for future simulation enhancements.

Author: OpenTools-run