feat: 添加 Windows 环境变量编辑器 GUI 应用程序

- 基于 IUP GUI 库开发 Windows 环境变量编辑器
- 实现 PATH 变量的加载、编辑、保存功能
- 提供新建、编辑、浏览、删除、上下移动路径等操作
- 添加管理员权限检查，确保系统变量修改权限
- 包含完整的项目构建配置（Makefile）和依赖库

libs/iup-3.31_Win64_dllw6_lib/include/iupgl.h

@@ -0,0 +1,97 @@
+/** \file
+ * \brief OpenGL canvas for Iup.
+ *
+ * See Copyright Notice in "iup.h"
+ */
+ 
+#ifndef __IUPGL_H 
+#define __IUPGL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Attributes 
+** To set the appropriate visual (pixel format) the following
+** attributes may be specified. Their values should be set
+** before the canvas is mapped to the scrren.
+** After mapping, changing their values has no effect.
+*/
+#ifndef IUP_BUFFER    /* IUP_SINGLE (defaut) or IUP_DOUBLE */
+#define IUP_BUFFER    "BUFFER"
+#endif
+#ifndef IUP_STEREO    /* IUP_NO (defaut) or IUP_YES */
+#define IUP_STEREO     "STEREO"
+#endif
+#ifndef IUP_BUFFER_SIZE    /* Number of bits if index mode */
+#define IUP_BUFFER_SIZE    "BUFFER_SIZE"
+#endif
+#ifndef IUP_RED_SIZE    /* Number of red bits */
+#define IUP_RED_SIZE    "RED_SIZE"
+#endif
+#ifndef IUP_GREEN_SIZE    /* Number of green bits */
+#define IUP_GREEN_SIZE    "GREEN_SIZE"
+#endif
+#ifndef IUP_BLUE_SIZE    /* Number of blue bits */
+#define IUP_BLUE_SIZE    "BLUE_SIZE"
+#endif
+#ifndef IUP_ALPHA_SIZE    /* Number of alpha bits */
+#define IUP_ALPHA_SIZE    "ALPHA_SIZE"
+#endif
+#ifndef IUP_DEPTH_SIZE    /* Number of bits in depth buffer */
+#define IUP_DEPTH_SIZE    "DEPTH_SIZE"
+#endif
+#ifndef IUP_STENCIL_SIZE  /* Number of bits in stencil buffer */
+#define IUP_STENCIL_SIZE  "STENCIL_SIZE"
+#endif
+#ifndef IUP_ACCUM_RED_SIZE  /* Number of red bits in accum. buffer */
+#define IUP_ACCUM_RED_SIZE  "ACCUM_RED_SIZE"
+#endif
+#ifndef IUP_ACCUM_GREEN_SIZE  /* Number of green bits in accum. buffer */
+#define IUP_ACCUM_GREEN_SIZE  "ACCUM_GREEN_SIZE"
+#endif
+#ifndef IUP_ACCUM_BLUE_SIZE  /* Number of blue bits in accum. buffer */
+#define IUP_ACCUM_BLUE_SIZE  "ACCUM_BLUE_SIZE"
+#endif
+#ifndef IUP_ACCUM_ALPHA_SIZE  /* Number of alpha bits in accum. buffer */
+#define IUP_ACCUM_ALPHA_SIZE  "ACCUM_ALPHA_SIZE"
+#endif
+
+
+/* Attribute values */
+#ifndef IUP_DOUBLE
+#define IUP_DOUBLE  "DOUBLE"
+#endif
+#ifndef IUP_SINGLE
+#define IUP_SINGLE  "SINGLE"
+#endif
+#ifndef IUP_INDEX
+#define IUP_INDEX  "INDEX"
+#endif
+#ifndef IUP_RGBA
+#define IUP_RGBA  "RGBA"
+#endif
+#ifndef IUP_YES
+#define IUP_YES    "YES"
+#endif
+#ifndef IUP_NO
+#define IUP_NO    "NO"
+#endif
+
+void IupGLCanvasOpen(void);
+
+Ihandle *IupGLCanvas(const char *action);
+Ihandle* IupGLBackgroundBox(Ihandle* child);
+
+void IupGLMakeCurrent(Ihandle* ih);
+int IupGLIsCurrent(Ihandle* ih);
+void IupGLSwapBuffers(Ihandle* ih);
+void IupGLPalette(Ihandle* ih, int index, float r, float g, float b);
+void IupGLUseFont(Ihandle* ih, int first, int count, int list_base);
+void IupGLWait(int gl);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif