changed 'for' command syntax, now it's multivariable; added a new operator to define...

changed 'for' command syntax, now it's multivariable; added a new operator to define attributes (.=); added a new operator to express numerical ranges (ex. 1..100) and removed 'range' function; added 'int' function; removed style attribute 'background-image', now its functionality is merged into 'background' attribute (if the value begins with a slash '/', then it's treated as an image file); added an optional block (after element) specifying initial width and height into element expressions (ex. |b{90,90}|); improved wait/poll code; fixe wrong block parsing when tokenizing; added additional examples; minor changes.