docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BSGFxDisplayObject.h

@@ -0,0 +1,82 @@
+#pragma once
+
+#include "RE/B/BSGFxObject.h"
+
+namespace RE
+{
+	class BSGFxDisplayObject :
+		public BSGFxObject  // 00
+	{
+	public:
+		static constexpr auto RTTI{ RTTI::BSGFxDisplayObject };
+		static constexpr auto VTABLE{ VTABLE::BSGFxDisplayObject };
+
+		class InitialDisplayState
+		{
+		public:
+			// members
+			float originalWidth;   // 00
+			float originalHeight;  // 04
+		};
+		static_assert(sizeof(InitialDisplayState) == 0x08);
+
+		BSGFxDisplayObject(const Scaleform::GFx::Value& a_flashObject) :
+			BSGFxObject(a_flashObject)
+		{
+			ctor_shared();
+		}
+
+		BSGFxDisplayObject(const Scaleform::GFx::Value& a_flashObject, const char* a_relativePathToMember) :
+			BSGFxObject(a_flashObject, a_relativePathToMember)
+		{
+			ctor_shared();
+		}
+
+		BSGFxDisplayObject(const Scaleform::GFx::Movie& a_parentMovie, const char* a_pathToObject) :
+			BSGFxObject(a_parentMovie, a_pathToObject)
+		{
+			ctor_shared();
+		}
+
+		virtual ~BSGFxDisplayObject()
+		{
+			if (parentDisplayObject) {
+				parentDisplayObject->RemoveChild(*this);
+			}
+		}
+
+		void RemoveChild(const BSGFxDisplayObject& a_child) const
+		{
+			using func_t = decltype(&BSGFxDisplayObject::RemoveChild);
+			static REL::Relocation<func_t> func{ ID::BSGFxDisplayObject::RemoveChild };
+			return func(this, a_child);
+		}
+
+		// members
+		const BSGFxDisplayObject* parentDisplayObject{ nullptr };  // 40
+		InitialDisplayState       initialState;                    // 48
+
+	private:
+		void ctor_shared()
+		{
+			if (HasMember("height")) {
+				Scaleform::GFx::Value height;
+				if (GetMember("height", &height)) {
+					if (height.IsNumber()) {
+						initialState.originalHeight = static_cast<float>(height.GetNumber());
+					}
+				}
+			}
+
+			if (HasMember("width")) {
+				Scaleform::GFx::Value width;
+				if (GetMember("width", &width)) {
+					if (width.IsNumber()) {
+						initialState.originalWidth = static_cast<float>(width.GetNumber());
+					}
+				}
+			}
+		}
+	};
+	static_assert(sizeof(BSGFxDisplayObject) == 0x50);
+}