- removed macro's 'CLEAR_EDGES' and 'CLEAR_EDGES_DUAL'
- removed functions 'graphDecodeXHi' and 'graphDecodeXHiDual'
- removed functions 'graphDecodeXHi320' and 'graphDecodeXHiDual320'
graph.c
- converted assembly function 'graphDecodeXHi320' and 'graphDecodeXHiDual320' to C equivalents
- replaced calls to assembly function 'graphDecodeXHi320' by calls to C function 'graphDecodeHiX_C'
- replaced calls to assembly function 'graphDecodeXHiDual320' by calls to C function 'graphDecodeHiXDual_C'
- added function for decoding hires and dual playfield planar to chunky: 'graphDecodeHiOdd_C', 'graphDecodeHiEven', 'graphDecodeHiDualOdd' and 'graphDecodeHiDualEven'
- converted assembly functions 'graphDecodeXHi320' to C functions 'graphDecodeHiX_C'
- converted assembly functions 'graphDecodeXHiDual' to C functions 'graphDecodeHi2Dual_C'
graph.h
- added/removed some assembly/C declarations
