Enhance CMake configuration for PNG support and introduce vcpkg.json

- Updated CMakeLists.txt to conditionally enable PNG support based on the presence of the PNG library, improving compatibility for minimal builds.
- Added vcpkg.json to manage project dependencies, including zlib, libpng, sdl2, and abseil, streamlining package management.
- Modified CI workflow in ci.yml to simplify CMake configuration commands for better readability.
- Enhanced CMake scripts to ensure proper handling of dependencies in both minimal and regular builds, improving build reliability.

cmake/absl.cmake

@@ -1,7 +1,15 @@
-if (MINGW)
+if (MINGW OR WIN32)
+  add_subdirectory(src/lib/abseil-cpp)
+elseif(YAZE_MINIMAL_BUILD)
+  # For CI builds, always use submodule to avoid dependency issues
   add_subdirectory(src/lib/abseil-cpp)
 else()
-  find_package(absl)
+  # Try system package first, fallback to submodule
+  find_package(absl QUIET)
+  if(NOT absl_FOUND)
+    message(STATUS "System Abseil not found, using submodule")
+    add_subdirectory(src/lib/abseil-cpp)
+  endif()
 endif()
 set(ABSL_PROPAGATE_CXX_STD ON)
 set(ABSL_CXX_STANDARD 17)

cmake/sdl2.cmake

@@ -12,5 +12,23 @@ if(WIN32 OR MINGW)
     add_definitions("-DSDL_MAIN_HANDLED")
 endif()
 
-# libpng
-find_package(PNG REQUIRED)
+# libpng and ZLIB dependencies  
+if(WIN32 AND NOT YAZE_MINIMAL_BUILD)
+  # Use vcpkg on Windows
+  find_package(ZLIB REQUIRED)
+  find_package(PNG REQUIRED)
+elseif(YAZE_MINIMAL_BUILD)
+  # For CI builds, try to find but don't require
+  find_package(ZLIB QUIET)
+  find_package(PNG QUIET)
+  if(NOT ZLIB_FOUND OR NOT PNG_FOUND)
+    message(STATUS "PNG/ZLIB not found in minimal build, some features may be disabled")
+    set(PNG_FOUND FALSE)
+    set(PNG_LIBRARIES "")
+    set(PNG_INCLUDE_DIRS "")
+  endif()
+else()
+  # Regular builds require these dependencies
+  find_package(ZLIB REQUIRED)
+  find_package(PNG REQUIRED)
+endif()