Migrate project to C++11 with cxxopts and add GitHub Actions workflow

Major changes:
- Convert main.c to main.cpp with C++11 features
- Integrate cxxopts library for modern command-line argument parsing
- Add support for positional arguments and multi-DLL injection
- Fix extern "C" guards placement in all header files
- Remove unnecessary extern "C" blocks from .c source files
- Add GitHub Actions workflow for automated MSVC builds
- Update CMakeLists.txt for C++11 standard and cxxopts integration

Technical improvements:
- All header files now follow correct extern "C" pattern
- C source files cleaned from C++ linkage directives
- Ready for CI/CD with Visual Studio 2022 on Windows runners
- Modern C++ argument parsing with type safety

Author: woldann

.github/workflows/build.yml

@@ -0,0 +1,59 @@
+name: Build GhostInjector
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+  workflow_dispatch:
+
+jobs:
+  build-windows-msvc:
+    runs-on: windows-latest
+    
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+    
+    - name: Setup MSVC
+      uses: microsoft/setup-msbuild@v2
+    
+    - name: Configure CMake
+      run: |
+        cmake -B build -G "Visual Studio 17 2022" -A x64
+    
+    - name: Build
+      run: |
+        cmake --build build --config Release
+    
+    - name: Check DLL dependencies
+      shell: pwsh
+      run: |
+        Write-Host "=== Executable Info ==="
+        Get-ChildItem -Path build\Release\ghostinjector-*.exe | ForEach-Object {
+          Write-Host "File: $($_.Name)"
+          Write-Host "Size: $([math]::Round($_.Length / 1MB, 2)) MB"
+          Write-Host ""
+        }
+        Write-Host "=== Checking for MSVC Runtime Dependencies ==="
+        Write-Host "Note: This executable requires Visual C++ Redistributable (vcruntime140.dll, msvcp140.dll)"
+    
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: ghostinjector-windows-x64-msvc
+        path: build/Release/ghostinjector-*.exe
+        if-no-files-found: error
+        retention-days: 30
+    
+    - name: Create Release (on tag)
+      if: startsWith(github.ref, 'refs/tags/')
+      uses: softprops/action-gh-release@v1
+      with:
+        files: build/Release/ghostinjector-*.exe
+        draft: false
+        prerelease: false
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

CMakeLists.txt

@@ -1,5 +1,19 @@
 cmake_minimum_required(VERSION 3.10)
-project(GhostInjector VERSION 1.0.2 LANGUAGES C)
+project(GhostInjector VERSION 1.0.2 LANGUAGES C CXX)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+include(FetchContent)
+
+# Fetch cxxopts
+FetchContent_Declare(
+  cxxopts
+  GIT_REPOSITORY https://github.com/jarro2783/cxxopts.git
+  GIT_TAG v3.2.1
+)
+FetchContent_MakeAvailable(cxxopts)
 
 add_subdirectory(Neptune)
 add_subdirectory(NThread)
@@ -8,15 +22,18 @@ add_subdirectory(NThreadOSUtils)
 set(GHOSTINJECTOR_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
 set(GHOSTINJECTOR_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
 
-file(GLOB_RECURSE GHOSTINJECTOR_HEADERS CONFIGURE_DEPENDS ${GHOSTINJECTOR_INCLUDE_DIR}/*.h)
-file(GLOB_RECURSE GHOSTINJECTOR_SOURCES CONFIGURE_DEPENDS ${GHOSTINJECTOR_SOURCE_DIR}/*.c)
+file(GLOB_RECURSE GHOSTINJECTOR_HEADERS CONFIGURE_DEPENDS ${GHOSTINJECTOR_INCLUDE_DIR}/*.h ${GHOSTINJECTOR_INCLUDE_DIR}/*.hpp)
+file(GLOB_RECURSE GHOSTINJECTOR_SOURCES CONFIGURE_DEPENDS ${GHOSTINJECTOR_SOURCE_DIR}/*.c ${GHOSTINJECTOR_SOURCE_DIR}/*.cpp)
 
 string(TOLOWER ${PROJECT_NAME} PROJECT_NAME_LOWER)
 set(EXECUTABLE_NAME "${PROJECT_NAME_LOWER}-${PROJECT_VERSION}")
 
 add_executable(${EXECUTABLE_NAME} ${GHOSTINJECTOR_SOURCES})
 target_include_directories(${EXECUTABLE_NAME} PRIVATE ${GHOSTINJECTOR_INCLUDE_DIR})
-target_link_libraries(${EXECUTABLE_NAME} PRIVATE NThreadOSUtils)
+target_link_libraries(${EXECUTABLE_NAME} PRIVATE NThreadOSUtils cxxopts)
+
+# Dynamic linking - will use MSVC runtime DLLs (msvcp140.dll, vcruntime140.dll)
+# Removed: -static -static-libgcc -static-libstdc++
 
 target_compile_definitions(${EXECUTABLE_NAME} PRIVATE
   LOG_LEVEL_2