Import of changes since the 1.9.0 release

Minor comment/documentation corrections.

a2_IncRef() renamed as a2_Retain(), to match ZeeDraw style.

A2WT_* symbols renamed A2_W*.

Infinite loop check disabled when issuing instructions that
will be fixed up later.

Removed 'phase' from the instructions list in the syntax
highlighting xml. (It's been a control register of the
wtosc unit since way before the Audiality 2 rename!)

Autowiring default behavior changed: Units will now output
to ANY unit with inputs down the chain; not just the next
unit. This means a set of wtosc units followed by a panmix,
will all be wired to the inputs of that last unit.
Previously, all but the last wtosc would be wired to the
voice master output by default.

The cfg-all script now creates build directories inside the
source tree. (Doesn't matter when we're using git.)

Moved the project to GitHub!
(https://github.com/olofson/audiality2)