Short summary about the selected template engine

[murceca]

1. Measure rendering speed: the total rendering speed (the whole render function), time spent on template fetching, time spent on the rendering itself. The total rendering speed should be calculated as: time spent on template fetching PLUS time spent on the rendering itself.
2. Render a short summary about the selected template engine.
3. Move the short summary block into the same section together with template selection component and JSON data editor.

An example of the summary block:

Selected rendering template: EJS
Version: 14.2.0

Template engine modules size: 128KB

Template requesting speed: 290Ms
Template rendering: 10Ms
Total rendering speed: 300Ms