ttcn3_makefilegen should have command line parameter to switch back to legacy PER

Summary

ttcn3_makefilegen should have command line parameter to switch bank to legacy PER

What is the expected correct behavior?

The compiler accepts the -H parameter to switch back to legacy PER. The makefilegen already uses this parameter for other purposes.

Possible fixes

Any other way (e.g. -legacy-per) option should be OK

Titan version

11.0.0

Platform details (OS type and version)

All

/cc @aknappqwt @mmagyari