简单的基于C#+ArcGIS Engine的插件编程，建立系统框架，实现GIS基本功能,Simple C#+ArcGIS Engine plug-in programming, establish a system framework to achieve the basic functions of GIS

基于c++的插件系统框架，加载插件、获取插件、卸载插件(C++ based plug-in system framework, loading plug-ins, access to plug-ins, uninstall plug-ins)