Debugger: Lua - Add emu.readRegister and emu.writeRegister
#75
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This PR adds two functions to the Lua API for reading from or writing to selected internal registers and pseudo-registers directly, without having to go through
emu.getStateevery time, which creates very large tables with values the caller isn't interested in (the SNES one for example has 602 entries). This is especially useful for setting individual flags in a status register, see my forum comment that led to this PR.The interpretations of the registers are identical to debugger expressions for the most part, with two notable exceptions: ML and MH are distinct registers on the CX4, and PC is read-only on the WonderSwan.