cmState: Move extracted declarations to a separate file

Source/cmStateTypes.h

@@ -0,0 +1,55 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#ifndef cmStateTypes_h
+#define cmStateTypes_h
+
+#include "cmLinkedTree.h"
+
+namespace cmStateDetail {
+struct BuildsystemDirectoryStateType;
+struct SnapshotDataType;
+struct PolicyStackEntry;
+typedef cmLinkedTree<cmStateDetail::SnapshotDataType>::iterator PositionType;
+}
+
+namespace cmStateEnums {
+
+enum SnapshotType
+{
+  BaseType,
+  BuildsystemDirectoryType,
+  FunctionCallType,
+  MacroCallType,
+  IncludeFileType,
+  InlineListFileType,
+  PolicyScopeType,
+  VariableScopeType
+};
+
+enum TargetType
+{
+  EXECUTABLE,
+  STATIC_LIBRARY,
+  SHARED_LIBRARY,
+  MODULE_LIBRARY,
+  OBJECT_LIBRARY,
+  UTILITY,
+  GLOBAL_TARGET,
+  INTERFACE_LIBRARY,
+  UNKNOWN_LIBRARY
+};
+
+enum CacheEntryType
+{
+  BOOL = 0,
+  PATH,
+  FILEPATH,
+  STRING,
+  INTERNAL,
+  STATIC,
+  UNINITIALIZED
+};
+}
+
+#endif