Add Raspberry Pi Sense HAT-related drivers

[MacroYau]

This PR includes the following drivers related to the Sense HAT:

• 5-button miniature joystick
• ST LPS25H barometric pressure and temperature sensor
• ST HTS221 relative humidity and temperature sensor

The Sense HAT metadriver has been updated accordingly. Only the Sense HAT IMU driver is missing now.

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[MacroYau]

I signed it!

[googlebot]

CLAs look good, thanks!

[proppy]

can you git rebase -i and remove 9afde04 ?

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[MacroYau]

@proppy I got some mistakes during rebase and I will file a new PR when I fix it.