frontend-utils: Add bundle player options

[sleepycatcoding]

Differences in the specification between the gist and this PR.

• Some examples in the gist referred to their old names, this has been fixed.
• Explicitly mentions that frame rate can be a floating-point value as well as an integer. (Changed for consistency, since script_timeout allows both)
• Fixed typo in frame_rate description (Maybe be -> May be).

cc @Dinnerbone