New printchar instruction

[cardillan]

A new printchar instruction has been added to the latest version (BE).

While it is possible to create the instruction using the mlog function:

inline def printchar(ascii)
    mlog("printchar", in ascii);
end;

the problem is that the instruction manipulates the text buffer, which the optimizer is unaware of. For safe use the print merging optimization would have to be turned off by #set print-merging = none;.

In the next version, the instruction will be added to the Logic 8 instruction set, the optimizer will be made aware of it, constant arguments will be properly evaluated and merged and the processor emulator will recognize the instruction.

Notes:

• The instruction allows printing double quotes to the text buffer.
• The instruction allows printing content icons directly. This should be recognized and potentially optimized by print merger.