Various CPU updates

- Sign extend values read using LH

- Add conversion functions to represent Signed/Unsigned 16-bit ranges
- Add overflow and truncation functions for 16-bit ranges

- Sign extend imm value in ADD(U)
- Add component overflow and truncation to ADD/SUB functions
- Construct new value in logic operators where result using inputs is undefined

- Return a valid W component from logic operators (if either input has one)

- Compare against high value (y), then low value (x) in less than operators

- Use doubles and implement overflow for Multiply operations to try to increase accuracy

- Use unsigned values in both MUL and DIV operations to make output as accurate as possible

- Implement several variants of shift operators. Trying both arithmetically correct and more analytical approaches with varying success.

Debug updates
- Added ability to force all values to be equal to low precision values before operating on them
- Added feature to test output of operations against a tolerance and print only those which fail

GPU updates
- Colour vertices with valid XY coordinates but no W as cyan to make them easier to spot
- Remove cyan colouring for stale vertices (wasn't useful)
- Added ability to skip debug rendering when needed (like seeing the output of offscreen rendering applied to a sprite).
- Added new mode which shows primitive type

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