refactor on CallWhen

[yellowbean]

The call can be described in pure "<Condition>" and "Formula"

Here: ,{"poolFactor":0.03}

can be rewrited into a Condition : ["poolFactor,">",0.03], which is more expressiveness

To Do:

• refactor on Hastructure level , which the callWhen only accepts a Pre
• to keep backward compatibility, write thin layer of function to convert ,{"poolFactor":0.03} to ["poolFactor,">",0.03]