Now that UInt8 has become part of the list of default types compiled,
there have been numerous warnings that have popped up about converting
ints to unsigned char. The reason for these is when you do arithmetic
(+, -, *, or /) on a char or short, it is automatically upconverted to a
32-bit integer. When you then try to set that back to a smaller integer,
you get a conversion warning.
This change gets around this problem by explicitly telling the compiler
we expect this type with static_cast. We have also talked about
disabling conversion warnings, but this has not happened on all
dashboards, and it is not that hard to work around the warning.
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