OBLCD: Support in SPLat/PC

SPLat/PC provides simulation support for the onboard LCD:

• Supports all LCD types.
• Display simulation with 99% accuracy.
• Special characters are all represented except X-bar, which does not exist in standard Windows fonts.
• The OBLCD_ instructions are all simulated except OBLCD_GoIfBusy, OBLCD_GoIfIdle, OBLCD_WaitIdle.
• OBLCD_RUT returns true if the simulated screen is open.
• Access to the LCD through low level UV instructions is not supported, but UV gets modified in a realistic way by the high level OBLCD_ instructions.
• Floating point formatting will produce minor discrepancies due to rounding and algorithm differences.

Versions of SPLat/PC prior to V7.15.1 did not have OBLCD simulation.