Map Note: <ulds> JSON </ulds>
"name": picture filename
"path": picture path (default to Default Path)
"loop": true/false
Whether the picture should loop.
"hue"/"smooth": the attribute of a Bitmap.
<attribute>: the attribute of a Sprite.
A string can be used as a value to be interpreted as a formula.
In the formula, 't' refers to frame count.
's' refers to $gameSwitches.
'v' refers to $gameVaribles.
Also, various helpers are available, defined in Helper.
If a string is used as a formula of the attribute,
the attribute will be updated every frame.
By the way, attributes such as "anchor.x" is also available.