[studio/modlib] Update ImGui drag/drop, other cleanup

src/olympic/studio/modlib/include/studio/imguiutil.hpp

@@ -9,11 +9,20 @@
 #include <imgui.h>
 
 #include <ox/std/bit.hpp>
+#include <ox/std/cstringview.hpp>
+#include <ox/std/stringparam.hpp>
+#include <ox/claw/claw.hpp>
 
-#include <turbine/context.hpp>
-#include <studio/context.hpp>
 #include <studio/widget.hpp>
 
+namespace turbine {
+class Context;
+}
+
+namespace studio {
+struct Context;
+}
+
 namespace studio::ig {
 
 inline constexpr auto BtnSz = ImVec2{52, 22};
@@ -31,18 +40,18 @@ ox::Result<T> getDragDropPayload(ox::CStringViewCR name) noexcept {
 		return ox::Error(1, "No drag/drop payload");
 	}
 	return ox::readClaw<T>({
-			std::launder(reinterpret_cast<char const*>(payload->Data)),
+			static_cast<char const*>(payload->Data),
 			static_cast<size_t>(payload->DataSize)});
 }
 
 template<typename T>
 ox::Result<T> getDragDropPayload() noexcept {
-	auto const payload = ImGui::AcceptDragDropPayload(ox::ModelTypeName_v<T>);
+	auto const payload = ImGui::AcceptDragDropPayload(ox::ModelTypeName_v<T>.c_str());
 	if (!payload) {
 		return ox::Error(1, "No drag/drop payload");
 	}
 	return ox::readClaw<T>({
-			reinterpret_cast<char const*>(payload->Data),
+			static_cast<char const*>(payload->Data),
 			static_cast<size_t>(payload->DataSize)});
 }
 
@@ -55,7 +64,7 @@ ox::Error setDragDropPayload(ox::CStringViewCR name, auto const &obj) noexcept {
 template<typename T>
 ox::Error setDragDropPayload(T const &obj) noexcept {
 	OX_REQUIRE(buff, ox::writeClaw(obj, ox::ClawFormat::Metal));
-	ImGui::SetDragDropPayload(ox::ModelTypeName_v<T>, buff.data(), buff.size());
+	ImGui::SetDragDropPayload(ox::ModelTypeName_v<T>.c_str(), buff.data(), buff.size());
 	return {};
 }
 
@@ -64,8 +73,8 @@ class DragDropSource {
 	private:
 		bool const m_active{};
 	public:
-		DragDropSource(ImGuiDragDropFlags const flags = 0) noexcept:
-			m_active(ImGui::BeginDragDropSource(flags)) {
+		explicit DragDropSource(ImGuiDragDropFlags const flags = 0) noexcept:
+			m_active{ImGui::BeginDragDropSource(flags)} {
 		}
 		~DragDropSource() noexcept {
 			if (m_active) {