porting shell from nuget to local

src/Shared/Microsoft.Windows.Shell/Standard/STATE_SYSTEM.cs

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+using System;
+
+namespace Standard
+{
+	[Flags]
+	internal enum STATE_SYSTEM
+	{
+		UNAVAILABLE = 1,
+		SELECTED = 2,
+		FOCUSED = 4,
+		PRESSED = 8,
+		CHECKED = 16,
+		MIXED = 32,
+		INDETERMINATE = 32,
+		READONLY = 64,
+		HOTTRACKED = 128,
+		DEFAULT = 256,
+		EXPANDED = 512,
+		COLLAPSED = 1024,
+		BUSY = 2048,
+		FLOATING = 4096,
+		MARQUEED = 8192,
+		ANIMATED = 16384,
+		INVISIBLE = 32768,
+		OFFSCREEN = 65536,
+		SIZEABLE = 131072,
+		MOVEABLE = 262144,
+		SELFVOICING = 524288,
+		FOCUSABLE = 1048576,
+		SELECTABLE = 2097152,
+		LINKED = 4194304,
+		TRAVERSED = 8388608,
+		MULTISELECTABLE = 16777216,
+		EXTSELECTABLE = 33554432,
+		ALERT_LOW = 67108864,
+		ALERT_MEDIUM = 134217728,
+		ALERT_HIGH = 268435456,
+		PROTECTED = 536870912,
+		VALID = 1073741823
+	}
+}