Added new template with demo and quick install.

Added template demo and quick install. The template is implemented with the ability to change the color scheme in the design editor.
View Demo
Install template.

Added new template with demo and quick install.

Scroll mode added to Categories and Producers widget
Added a function for selecting ready-made color schemes for templates «templates_universal_flex».
Attention! 08/17/2018 will be used in maintenance and operation services.