[ao] idea: redo offsets for ao; use a listen for a cmd in local

[lickx]

OsCollar AO: Use /2offset \<float> to adjust SitAnywhere offset (+ and - modifiers may be used) /2offset 0.25 [would set it to 0.25] OsCollar AO: new offset 0.25 stored /2offset -0.1 [would substract 0.1 from the current offset] OsCollar AO: new offset 0.15 stored /2offset +0.05 [would add 0.05 to the current offset] OsCollar AO: new offset 0.20 stored