qrcode optimize: partly addresses bwipp-js #237 by adding A or N inclusive sum

[gitlost]

Partly addresses bwipp-js issue #237 by adding A or N inclusive sum and in mode 0:

• moves checking for N mode before checking for A mode and uses new mode0forceN array for N before E instead of numN ge 1 check
• checks A or N before B and E instead of just A

and in mode B:

• chooses A for short A or N sequences at end that only contain smallish N sequences (restrictions required to avoid other unwanted switches)

Overall the changes should improve some encodations without disimproving others (hopefully).