Add part of a Windows event loop implementation

Cargo.toml

@@ -37,6 +37,16 @@ widestring = "1.0.0-beta.1"
 
 assert_no_alloc = { version = "1.1", optional = true }
 
+[target.'cfg(windows)'.dependencies.windows]
+version = "0.32"
+features = [
+  "Win32_Foundation",
+  "Win32_Graphics_Gdi",
+  "Win32_UI_WindowsAndMessaging",
+  "Win32_System_LibraryLoader",
+  "Win32_System_Performance",
+]
+
 [features]
 default = []
 # Enabling this feature will cause the plugin to terminate when allocations