Add roll when landing

[Richard-L]

This is currently still missing from the Lara tech and physics.

In the PS1 version, you can hold the roll button and Lara will perform a roll as soon as she can.

When landing after a regular jump:

https://user-images.githubusercontent.com/4934209/110716719-f9aa4680-8207-11eb-9e49-d04f30b0d2af.mp4

When landing after a jump that is too high (energy loss):

https://user-images.githubusercontent.com/4934209/110716757-0af35300-8208-11eb-9a28-cf67cd12f19c.mp4

You can also delay the roll a bit. Usually after a high jump, Lara has to go to her knees. This animation can be cancelled into a roll at any time:

https://user-images.githubusercontent.com/4934209/110716792-1cd4f600-8208-11eb-889d-384201001f92.mp4

You can also roll directly after an air bonk:

https://user-images.githubusercontent.com/4934209/110716839-3d04b500-8208-11eb-9d80-264583834451.mp4

Example of a combination. After the first jump you can hold roll, and because the ledges are so short she will hop down quite quickly. You can hold roll during this hole sequence:

https://user-images.githubusercontent.com/4934209/110716867-4b52d100-8208-11eb-81b3-5a69012e8b4c.mp4