Plugins that have the capability flag HWPLUG_CAPS_SAVEANIM set can register
one or more additional output animation formats. The user will then be able to save animations
in the output formats supported by the plugin. Plugins have to register new output
animation formats by passing the name of a constant that should be used to access the new format.
For example, a plugin might choose to register a new output animation format under the
constant #ANMFMT_CUSTOMFORMAT. Whenever the user calls a command like SaveAnim()
now and passes #ANMFMT_CUSTOMFORMAT as the animation format, Hollywood will ask the plugin to
save the animation.