c/main: Move A2B10G10R10 format to top, and add 16-bit float format.
10bit colour is the native format of the PSVR2. I'm not sure which should go first since on
displays which natively support float formats you would likely want that to come first.
However, since no other HMDs support 10bit colour or floating point formats to my knowledge,
this is fine for now.
Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2488>
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