Fix build system: resolve compilation errors and library path issues

[Copilot]

This PR fixes multiple build system issues that were preventing the SRPG engine project from compiling successfully.

Issues Fixed

1. Missing C Standard Library Include

The common.hpp file was using uint8_t without including <cstdint>, causing compilation failures:

// Before: compilation error
using byte = uint8_t;  // error: 'uint8_t' does not name a type

// After: fixed
#include <cstdint>
using byte = uint8_t;  // ✓ compiles successfully

2. SOL2 Template Compilation Errors

The embedded SOL2 v2.15.7 library had template ambiguity issues with modern C++ compilers. Fixed by making template calls explicit:

// Before: ambiguous template call
return stack::push<const wchar_t*>(L, str, str + sz);

// After: explicit template specialization
return pusher<const wchar_t*>::push(L, str, str + sz);

3. Incorrect Library Paths

All CMakeLists.txt files were looking for libraries in /bin/ directories instead of /lib/:

# Before: libraries not found
link_directories(${CMAKE_INSTALL_PREFIX}/srpg-engine/bin/)
link_directories(${CMAKE_INSTALL_PREFIX}/lua53/bin/)

# After: correct library paths  
link_directories(${CMAKE_INSTALL_PREFIX}/srpg-engine/lib/)
link_directories(${CMAKE_INSTALL_PREFIX}/lua53/lib/)

4. C++ Syntax Error

Fixed malformed copy constructor and assignment operator declarations in simple-position-system:

// Before: syntax error
TilePositionSystem (const &TilePositionSystem){}
TilePositionSystem& operator=(const &TilePositionSystem){}

// After: correct C++ syntax
TilePositionSystem(const TilePositionSystem&){}
TilePositionSystem& operator=(const TilePositionSystem&){ return *this; }

Components Now Building Successfully

• lua53 - Lua 5.3 library foundation
• srpg-engine - Main game engine library
• simple-position-system - Position management system
• action-system - Action handling system
• s2dge-tilepos-adapter - Tile position adapter

Testing

All major components build cleanly with CMake and make:

cd srpg-engine && mkdir build && cd build && cmake .. && make  # ✓
cd simple-position-system && mkdir build && cd build && cmake .. && make  # ✓
cd action-system && mkdir build && cd build && cmake .. && make  # ✓

The changes are minimal and surgical, preserving all existing functionality while making the project buildable again.

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