Splits the existing On Death hook into independent hooks for each relevant type. Adds On Ship Death, On Missile Death, etc. Also adds On Missile Death Started to complement On Ship Death Started.
This takes a few of the existing hooks and converts them to the new style of hook definition which can include more extensive documentation and enumeration of supported hook variables.
This is an updated version of #3151 to work with the latest codebase.
NOTE: Before this can be integrated into the codebase, it needs an implementation for `bool script_state::IsActiveAction(int hookId)` which apparently only has support for old-style script hooks.
BMagnu