2.2.2 dev. snapshot: EMIT vector, more general Y=TOS

The 2.2.2 snapshot provides some important changes:

• vector for an EMIT word, e.g. for background task, but also for text output via a general Forth word
• Refactoring of most core words to Y=TOS, which means that assembly and STC code can be mixed more easily
• Improved NUMBER string conversion: new modifiers % for base 2 and & for base 10. The number strings %-111 and -%111 both result in -7.

Here is an example for valid number strings:

DECIMAL
$10 $-10 -$20 20 -20 %1111 -%1111 .S
 16 -16 -32 20 -20 15 -15 <sp  ok
HEX &16 . 10 ok

Since NUMBER was re-implemented in a mix of STC and assembly the binary size of this snapshot is significantly smaller even if there are more features.