Only create one tGlobal object
Only create one tGlobal object

This fixes a problem with getFPGATime() blocking for around 1 second
each time it's called.

Change-Id: I8aafb725889c231ffb2c91e7cb4bbb8110474a9d

RAR1741/wpilib,JLLeitschuh/allwpilib,PeterMitrano/allwpilib,333fred/allwpilib,robotdotnet/allwpilib,robotdotnet/allwpilib,333fred/allwpilib,PeterMitrano/allwpilib,PatrickPenguinTurtle/allwpilib,robotdotnet/allwpilib,RAR1741/wpilib,PatrickPenguinTurtle/allwpilib,RAR1741/wpilib,PeterMitrano/allwpilib,JLLeitschuh/allwpilib,RAR1741/wpilib,PeterMitrano/allwpilib,JLLeitschuh/allwpilib,RAR1741/wpilib,JLLeitschuh/allwpilib,robotdotnet/allwpilib,PatrickPenguinTurtle/allwpilib,PatrickPenguinTurtle/allwpilib,robotdotnet/allwpilib,PatrickPenguinTurtle/allwpilib,JLLeitschuh/allwpilib,333fred/allwpilib,PeterMitrano/allwpilib,PeterMitrano/allwpilib,RAR1741/wpilib,JLLeitschuh/allwpilib,333fred/allwpilib,JLLeitschuh/allwpilib,PeterMitrano/allwpilib,PatrickPenguinTurtle/allwpilib,PatrickPenguinTurtle/allwpilib,333fred/allwpilib,robotdotnet/allwpilib,333fred/allwpilib,RAR1741/wpilib