Support saves selected model in list when reloaded and loaded page
browser.
Write backend code get models in json format, and create file json default models for local server.
Add buttons refresh model list
Add in python file, api page from url http://ip:port/api/lth/
Chnage index.html (containers[wrappers] canvases)
Add to sahder Sobel, two other operations Sharra, Prewitt, and select
element for set him (experiment).
Fix ThreeCanvas.js, lines canvas material set normal.
Fix when delete model and add now, not set position and model not
visiability.
Other small fixes...
AlekPet