Add option for relative variables to TASfile

[ScribbleTAS]

While we are at it with TASfile changes, let's swap pitch and yaw to make it similar to the minecraft f3 screen.

• Swap pitch and yaw in TASfile
• Add option to use relative variables for pitch and yaw: ~20;~-14
• Do deltas for other absolute coordinates as well (Pointer location)
• Change scroll wheel to always have a ~ in front as that is always a delta. Allow for absolute variables