Stable script & setAbility +JSON load

[srferran]

Description

Stable building script needed. Stable can create cavalry units. Loading attributes from JSON must be setted too.

Acceptance criteria

• [x] Functional Script.
• [x] Attributes loaded from JSON
• [ ] Building can create cavalry units

Estimated time effort: 5h

[srferran]

This issue has been cancelled. There was no point in establishing parallel or duplicate structures.