feat: make gm registration simpler and safer

[EmosewaMC]

Tested that various combat and reports still function

[Copilot]

Pull Request Overview

This PR refactors the game message registration system to be simpler and safer by using template type deduction from function pointers instead of manual type specification and enum passing.

Key Changes:

• Replaced two-parameter RegisterMsg<MessageType>(this, &Handler) with single-parameter RegisterMsg(&Handler) that deduces the message type from the handler signature
• Updated all message handler functions to accept specific message types (e.g., GetObjectReportInfo&) instead of base GameMsg&, eliminating the need for static_cast operations
• Added new IsDead game message struct and corresponding handler in DestroyableComponent

Reviewed Changes

Copilot reviewed 40 out of 40 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
dGame/dGameMessages/GameMessages.h	Added new IsDead message struct
dGame/dComponents/Component.h	Refactored RegisterMsg template to deduce message type from handler signature with compile-time type safety checks
dGame/Entity.h	Updated RegisterMsg template and added forward declarations for game messages used in Entity handlers
dGame/Entity.cpp	Updated all message handler signatures and registration calls to use new pattern
dGame/dComponents/*.h	Updated all component message handler signatures to accept specific message types
dGame/dComponents/*.cpp	Updated handler implementations to use typed parameters and removed static_cast operations, simplified registration calls