MORTEVIELLE: Little refactoring of decryptNextChar()
MORTEVIELLE: Reorder some functions in mortevielle.h
MORTEVIELLE: Some more renaming
MORTEVIELLE: Simplify drawString code
MORTEVIELLE: Get rid of magic value 0x7000
MORTEVIELLE: Get rid of magic value 0x6000
MORTEVIELLE: Get rid of magic value 0x5000
MORTEVIELLE: Make use of _mem more homogeneous, fix a couple of errors in phoneme handling
MORTEVIELLE: Get rid of some more magic values
MORTEVIELLE: Remove dead code, update comment
MORTEVIELLE: Remove one more magic value, simplify draw()
MORTEVIELLE: Remove constants previously used by the mouse code
MORTEVIELLE: Get rid of the last remaining magic values used with _mem