Add new UWL section "estimations"

Add the new UWL section in the .meta {} section. The section is called "estimations".

.meta {
    estimations {
        ...
    }
}

The section contains the Javascript code of pipeline resources estimations. It returns the result of estimation: the array [time, RAM, HDD, CPU].

A set of Javascript functions for retrieving attributes values, files sizes and formats, etc are needed to be created. They will help to make estimations.

Automatic tests are required.