Alpha-numeric printf format (#2416)

* Implement an inspector view provider to display a component that allows setting printf format for alphanumeric items in a display layout.

* Display 'Mixed' in format input if items' formats in selection are different.

* Use lodash function to find index.

* Simplify code.

* Put the logic to disallow viewing the inspector view for multi-select in the inspector view provider as apposed to the inspector view component.

webpack.config.js

@@ -35,6 +35,7 @@ const webpackConfig = {
             "bourbon": "bourbon.scss",
             "vue": path.join(__dirname, "node_modules/vue/dist/vue.js"),
             "d3-scale": path.join(__dirname, "node_modules/d3-scale/build/d3-scale.min.js"),
+            "printj": path.join(__dirname, "node_modules/printj/dist/printj.min.js"),
             "styles": path.join(__dirname, "src/styles-new")
         }
     },