Standardize API documentation style

[mikeybanez]

(mostly copy pasted from internal issue tracking: PLG-175, some parts might already be accomplished or might be outdated)

Here's the list of classes that we should tidy up:

Core/Scene Class

• setName did not specify the parameter datatype (but has example)
• isEmpty did not specify the return datatype (but has example)
• searchAllForItemId does not have the standard parameter and return information
• searchSceneWithItemId did not specify parameter datatype (but has example)
• searchAllForItemName did not specify parameter datatype (but has example)

Core/Transition Class

• toString did not specify the return datatype
• toTransitionKey did not specify the return datatype

Core/AudioItem Class

• Missing parameter/return datatype and description on most methods
• No sample usage unlike other Item subclasses

Core/HTMLItem Class

• No sample usage unlike other Item subclasses

System/CameraDevice Class

• addToScene has no return datatype

System/Game Class

• addToScene has no return datatype
• getFpsRender, getFpsCapture, getImageName, and getReplace do not have any return datatype

System/MicrophoneDevice class

• addToScene has no return datatype

Util Module

• Color class and rectangle class do not have any documentation comments