-Removed case sensitivity (except for variables/symbol names)
-Added error logs
-NOZERO function added: nozero(x,y) returns x unless x=0 (then it returns y). To avoid implicit zero division errors

-Support for indicators: declared before the formula and separated with ";" from each other
-> Syntax: $declaration = NAME : param1, param2... ; other indicators... ; formula
-INDICATOR function added: indicator($declaration, buffer) returns the value of a given buffer of an indicator at any given candle

-Fixed errors with nested formulas in functions
-Removed excessive log prints (now only one for each error)

Minor fixes