Add initialize and deinitialize methods to abstract view model

Author: pcastornii

mvvm4fx-core/src/main/java/com/techsenger/mvvm4fx/core/AbstractComponentView.java

@@ -57,6 +57,7 @@ public final void initialize() {
             }
             preInitialize(viewModel);
             descriptor.stateWrapper().set(ComponentState.INITIALIZING);
+            viewModel.initialize();
             build(viewModel);
             bind(viewModel);
             addListeners(viewModel);
@@ -85,6 +86,7 @@ public final void deinitialize() {
             removeListeners(viewModel);
             unbind(viewModel);
             unbuild(viewModel);
+            viewModel.deinitialize();
             descriptor.stateWrapper().set(ComponentState.DEINITIALIZED);
             logger.debug("{} Deinitialized component", descriptor.getLogPrefix());
             postDeinitialize(viewModel);

mvvm4fx-core/src/main/java/com/techsenger/mvvm4fx/core/AbstractComponentViewModel.java

@@ -121,6 +121,10 @@ public void setComposer(Composer composer) {
         this.composer = composer;
     }
 
+    protected void initialize() {
+
+    }
+
     protected void postHistoryRestore() {
 
     }
@@ -129,6 +133,10 @@ protected void preHistorySave() {
 
     }
 
+    protected void deinitialize() {
+
+    }
+
     protected abstract ComponentDescriptor createDescriptor();
 
     private ComponentHistory getOrRequestHistory() {