Game schema - Draft 3

Formalize game schema using JSON Schema Draft-07 specification.

Overhaul manifest structure.

Game schema - Draft 2

Adds the following properties to the Schema defined in draft1:

• wip, work-in-progress flags
• files, Array of 2-d arrays - related files and their descriptions

Game schema - Draft 1

7 mandatory fields and 11 optional ones, this game JSON format specification should cover the majority of information we want to present and we need to tag, search, filter and sort the entries.

This is the first official draft and sets the standard specification we will follow, comply and implement, until futher revisions.