TVI By Melis with inputs

Added the option for an existing script (tradingview.com/script/hdEWUc2c/). Many recommendations for TVI are for 8,8,5 so I got the mq4 source code it was based on and gave the options for those inputs in pinescript. Settings and source code information was found in this forum from Forex Factory. (forexfactory.com/showthread.php?t=226154)