initial import of plugin loading code

little fixes to API
temporarily commented dependency iface until final

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40177

core/vm/sp_vm_engine.cpp

@@ -56,11 +56,6 @@ IPluginContext *SourcePawnEngine::CreateBaseContext(sp_context_t *ctx)
 
 void SourcePawnEngine::FreeBaseContext(IPluginContext *ctx)
 {
-	sp_context_t *_ctx = ctx->GetContext();
-	IVirtualMachine *vm = ctx->GetVirtualMachine();
-	
-	vm->FreeContext(_ctx);
-
 	delete ctx;
 }