Assemblers

• New assembler listings supported: "sjasmplus".
• Better support for z88dk-z80asm.
• New parameters "asm" and "srcDirs".
• '-eval' now evaluates also label names with a starting "_".
• Dropped support for label files. The labels are extracted anyway from the list file.
• Watches allow now more complex expressions not only labels. Now e.g. "dlistw+3" is supported.
• Changed appearance of memory viewer: Added a column header and a legend for the register colors.