modify Example to use DisplayManager instead of ScreenRetriever, and update submodule reference for libnativeapi.

Author: lijy91

Package.swift

@@ -16,8 +16,8 @@ let package = Package(
             path: "Sources/libnativeapi",
             exclude: [
                 "examples",
-                "src/screen_retriever_linux.cpp",
-                "src/screen_retriever_windows.cpp",
+                "src/display_manager_linux.cpp",
+                "src/display_manager_windows.cpp",
             ],
             linkerSettings: [
                 .linkedFramework("Cocoa"),

Sources/Example/main.swift

@@ -1,13 +1,13 @@
 import nativeapi
 
-var screenRetriever = nativeapi.ScreenRetriever()
-let cursorPoint = screenRetriever.GetCursorScreenPoint()
-let primaryDisplay = screenRetriever.GetPrimaryDisplay()
-let allDisplays = screenRetriever.GetAllDisplays()
+var displayManager = nativeapi.DisplayManager()
+let allDisplays = displayManager.GetAll()
+let primaryDisplay = displayManager.GetPrimary()
+let cursorPosition = displayManager.GetCursorPosition()
 
-print(cursorPoint)
+print(cursorPosition)
 print(primaryDisplay)
 print(allDisplays)
 
-print(primaryDisplay.id)
-print(primaryDisplay.name)
+print(primaryDisplay.width)
+print(primaryDisplay.height)