[Open Assets] Sonic Drop Dash and Double Jump 1.3

This script removes Sonic's speed thok, instead allowing him to perform both a double jump and a drop dash.

• Press jump in the air to double jump. Press jump once more to perform a shield ability (if you have one)
• Hold spin in the air to perform an instant spindash on landing. Sonic can use this move even if he already has a shield or has double jumped.
• Toggle metalthok in console to give Metal Sonic the speed thok and remove his dash mode ability.

Credits and Re-Use Guidelines
All assets can be reused and all scripts can be freely modified. Please credit DirkTH in the event that any sprite assets are reused.