Added the virtual table _VT_HINT.
It can be queried using the public synonym VT_HINT.

The column information is as follows.

- NAME : hint name
- CATEGORY : hint category
- EXPLANATION_KO : Korean explanation
- EXPLANATION_EN : English explanation

Hints specified in the manual reflect the information from the manual.
Other hints were created arbitrarily.
Hints in the INTERNAL USE ONLY category do not have explanations added.