Add the ability to place ambient SoundEmitters via the editor

[stubb]

From @prock-fife on January 26, 2010 23:57

This ticket is to add the ability to attach one or more ambient SoundEmitter(s) to an instance on a map through code and via the map editor.

The design of this still has to be discussed.

Copied from original issue: fifengine/fifengine#434

[stubb]

From @prock-fife on June 3, 2010 10:15

to 0.3.3

[stubb]

From @prock-fife on September 25, 2010 1:50

to 0.3.4