Plugin load type too strict for shared type

[yuxiaomao]

For the moment the plugin system only load a class if Plugin and Main share exactly the same definition for excluded classes.

This isn't pratical for real use cases, where we'd like to build Plugin independent of Main. E.g.

• add some private variables/function in some class, without the need to rebuild the Plugin;
• allow h3d.Buffer remains Dynamic in the Plugin but have a driver definition in Main to avoid useless dependencies;
• do not actually include and try to load all classes if the Plugin does not depend on it