improve chalkit api

[abirEF]

• improve parse: simple quote, double quote, handle blank space,...
• ignore api when inside a comment or string
• handle setVariable list during execution and not during parse to be more effective (take into account current valid condition)
• improve its use: with direct access, through variable, or through direct formula

Examples with setVariable API:

1. chalkit.setVariable("value",10);//double quote
2. chalkit.setVariable('value',20);//simple quote
3. val ="value"; chalkit.setVariable(val,30);//string variable
4. val =dataNodes["value"]+1; chalkit.setVariable("value",val);//value from dataNode
5. chalkit.setVariable("value",dataNodes["value"]+1); //formula in values
6. chalkit.setVariable( "value" , 60 );//test on white space
7. val ="valu"; chalkit.setVariable(val+"e",70);//concact names
8. chalkit.setVariable("",80);//provoke error and notify it
9. chalkit.setVarible("value",10);//syntax error
10. xDashApi.setVariable("value",10);//warning about a deprecated fct

[bengaid]

Great Abir ! Seems complete for me.