Value Displays and Editors should always have and receive parent container instead of injecting the editor into the HTML

[shamansir]

From #417 and #434

[shamansir]

It is resolved for SVG styles, but fails for most of the HTML styles, so probably it should be fixed in the styles, not in the renderer (since they create the HTML element to hold the value).

[shamansir]

No, the problem is actually different:

• There's always a .value-holder for inlets, a wrapper for a .value, since they need a parent element where editor needs to be injected;
• There's no .value-holder for outlets, since they need no editor;
• channelrenderer.show should work for both cases;
• Channel Renderers currently inject value directly into the element using innerHtml for both cases;