fix(ci): Update for SM 1.13

[Rushaway]

This pull request updates the build scripts to support newer versions of SourceMod, Metamod:Source, and C++ compilers, and adds support for the SafetyHook library if present. It also modernizes the build requirements to require C++17 and updates platform-specific build flags for better compatibility and performance.

Build System Modernization and Dependency Updates:

• Updated SourceMod and Metamod:Source detection to prefer newer versions (sourcemod-1.13 and mmsource-1.12) and improved fallback logic for finding their source directories. [1] [2]
• Changed the CI workflow to build against the latest sourcemod master branch instead of the old 1.11-dev branch.

Compiler and Platform Support:

• Increased minimum supported compiler versions to require full C++17 support: MSVC 2017 15.7+ (_MSC_VER 1914+), GCC 9+, and Clang 5+. Updated all relevant C++ flags to use -std=c++17 or /std:c++17. [1] [2] [3]
• Updated macOS deployment target to 10.15 and added/adjusted platform-specific defines for Linux and macOS. [1] [2]

SafetyHook Integration:

• Added logic to detect and integrate the SafetyHook library if present in the SourceMod public directory. This includes copying the library locally, building it as a dependency, and linking it in place of legacy detour code. [1] [2] [3] [4]

Build Flags and Warning Handling:

• Updated and cleaned up compiler warning flags, removed deprecated flags, and improved handling of architecture-specific and compiler-specific options. [1] [2]

These changes ensure the project builds with modern toolchains and dependencies, and can take advantage of the SafetyHook library for detouring if available.