Add PNG and wxWidgets 3.1.3 uniformly to all platforms with cmake build.

wx is built with png as a dependency, wxpng is disabled.

deps/wxWidgets/wxWidgets.cmake

@@ -0,0 +1,36 @@
+set(_wx_git_tag v3.1.3-patched)
+
+# set(_patch_command "")
+set(_wx_toolkit "")
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    set(_gtk_ver 2)
+    if (DEP_WX_GTK3)
+        set(_gtk_ver 3)
+    endif ()
+    set(_wx_toolkit "-DwxBUILD_TOOLKIT=gtk${_gtk_ver}")
+endif()
+
+prusaslicer_add_cmake_project(wxWidgets
+    GIT_REPOSITORY "https://github.com/prusa3d/wxWidgets"
+    GIT_TAG ${_wx_git_tag}
+    # PATCH_COMMAND "${_patch_command}"
+    DEPENDS ${PNG_PKG} ${ZLIB_PKG} ${EXPAT_PKG}
+    CMAKE_ARGS
+        -DwxBUILD_PRECOMP=ON
+        ${_wx_toolkit}
+        "-DCMAKE_DEBUG_POSTFIX:STRING="
+        -DwxUSE_DETECT_SM=OFF
+        -DwxUSE_UNICODE=ON
+        -DwxUSE_OPENGL=ON
+        -DwxUSE_LIBPNG=sys
+        -DwxUSE_ZLIB=sys
+        -DwxUSE_REGEX=builtin
+        -DwxUSE_LIBXPM=builtin
+        -DwxUSE_LIBJPEG=builtin
+        -DwxUSE_LIBTIFF=builtin
+        -DwxUSE_EXPAT=sys
+)
+
+if (MSVC)
+    add_debug_dep(dep_wxWidgets)
+endif ()