Add OFX plugin support and related infrastructure

This commit extends the OFX plugin support in Olive by:

- Initializing and scanning for OFX plugins
- Updating PluginNode to handle OFX plugin parameters and inputs
- Adding necessary methods and properties for OFX plugin integration
- Enhancing NodeFactory to include OFX plugin nodes
- Refactoring and renaming OliveInstance to OlivePluginInstance
- Introducing new classes for parameter handling (ParamInstance)
- Adding PluginJob for rendering OFX plugins
- Adjusting CMakeLists.txt files to include new source files

app/node/traverser.cpp

@@ -387,6 +387,10 @@ QVector2D NodeTraverser::GenerateResolution() const
 					 video_params_.height());
 }
 
+/**
+ * Resolve Jobs. I need to add a PluginJob here and move the plugin code here.
+ * @param val
+ */
 void NodeTraverser::ResolveJobs(NodeValue &val)
 {
 	if (val.type() == NodeValue::kTexture) {