Previously the plugin system was obviously built around function
pointers, since a loaded plugin DLL would expose them statically.
This meant that the plugin classes I implemented also had to use
static methods, and all the variables had to be static as well.
This has been getting more and more annoying. So this commit is
an in-progress refactoring of AGS to allow for plugins to be
properly instance-based, and pointers to script methods will be
both a pointer to the plugin as well as the method name.
The text is now rendered directly to the existing virtual screen,
rather than creating a new one then blitting over the background,
applying the text on it, and then making it the active screen
the AGS codebase comes with the option to build with several
built-in plugins that code is provided for. These will still
need to be cleaned up for the ScummVM DLL implementation
Eugene Sandulenko
Paul Gilbert