TcUnit 1.3.1

Fixed issues/improvements:

• Fix duration measurement on TEST_ORDERED and add unit tests for duration, see #228 & #231
• Add os independent environment variable at parameter xUnitFilePath, see #232, #233 & #239
• Fix spelling, see #243
• Added an FAQ for VAR_INST initialization, see #242
• Documentation Update: Programming Example Broken Link, see #238
• TcUnit example for running over multiple cycles - link is broken, see #234 & #236

Contributors:

❤️ @dfreiberger
❤️ @philippleidig
❤️ @rruiter87
❤️ @ColonelPanic-Dev
❤️ @sebvc
❤️ @sagatowski