itech/itech8.cpp: Various cleanups #12235
Merged
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Reduce unnecessary lines
Reduce preprocessing defines
Constantize variables
Use correct typename values
Use C++ style comment for single line comments
Use palette_device for grmatch color behaviour
Remove unpopulated device
Fix filename comments
Use input_merger for FIRQ with VIA
Use machine().side_effect_disabled() for avoid debugger issue
Replace pointers to references
Fix spacing in metadatas