Write couple of conversion functions

The goal is to complete the following 4 tasks:

-  finish all @todo's for Order methods in Order.mqh so the code works both in MQL4 and MQL5

-  write GetPipSize() to work for currencies and Gold/Silver for different digits (improve code: Digits % 2 == 0 ? MODE_POINT : MODE_POINT * 10)

-  finish PointsToValue() to work for Forex, CFD, Futures and CFD for indices.

-  generate 3 small FXT files one or few days tick long with : All ticks, control points and open prices, for testing purposes