Method clear

KBotExt/imgui/imgui.h:2310–2310

	int                 size() const { return Buf.Size ? Buf.Size - 1 : 0; }
	bool                empty() const { return Buf.Size <= 1; }
	void                clear() { Buf.clear(); }
	void                reserve(int capacity) { Buf.reserve(capacity); }
	const char* c_str() const { return Buf.Data ? Buf.Data : EmptyString; }
	IMGUI_API void      append(const char* str, const char* str_end = NULL);