chore: modernize RakNet to current C++ and CMake standards#1

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copilot/update-codebase-to-new-standards

Commits on Apr 30, 2026

chore: modernize codebase - cmake 3.10, pragma once, cstdint, nullptr, remove register keyword

Copilot
and
Avedith
authored
fix: resolve unsigned loop underflow, memcpy over-read, and strcpy overflow

Copilot
and
Avedith
authored