New ctrl + key support, new help screen and bug solved in route 'path finding'
New function Vtracert::ctrlUnicode(c) that returns the unicode representation of ctrl+letter.
New function Vtracert.help() that display an help screen
New path finding for routes, now they take the shorter horizontal direction (added a new propertie VtraceMap.scaledWidth updated by VtraceMap.genXlimits() to perfom this)
Various small code refactor and comments