[PATCH] Redraw documentation images

[Marçal]

This patch serves to update all the images in the RTEMS documentation with
the redrawings we did during GCI 2018.

All the redrawings included in the patch were made by me except
images/c_user/states which was made by LukaMag.

Patch:
https://drive.google.com/file/d/1yGMIWGOyDKoyma6YZZTtxRyyPVLqPF_j/view?usp=sharing
(it's a Google Drive link because the list doesn't let me send messages
bigger than 256 KB and the patch, because of the images, is bigger than 5
MB).

I think that this is my last patch for Google Code-in 2018. It's been a
pleasure working with the RTEMS Project. Thanks for everything! :)

Best,
Marçal (Sal)
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