Restructered pit-swing to better follow MVC paradigm.

Adding extensibility features for pit-swing.

pit-swing/griffon-app/models/com/jdbernard/pit/swing/PITModel.groovy

@@ -1,8 +1,34 @@
 package com.jdbernard.pit.swing
 
+import com.jdbernard.pit.Category
+import com.jdbernard.pit.Filter
+import com.jdbernard.pit.Issue
 import com.jdbernard.pit.Project
+import com.jdbernard.pit.Status
 import groovy.beans.Bindable
 
 class PITModel {
     @Bindable Project rootProject
+
+    // cache the ListModels
+    def projectListModels = [:]
+
+    // filter for projects and issues
+    Filter filter = new Filter(categories: [],
+        status: [Status.NEW, Status.VALIDATION_REQUIRED])
+
+    @Bindable Project popupProject = null
+
+    @Bindable Project selectedProject = null
+
+    @Bindable Issue popupIssue = null
+
+    // configurable exntension points
+    // ==============================
+
+    @Bindable def issueListRenderer
+
+    // map of category -> issue template
+    def templates = [:]
+
 }