Calling from command line:
 * Added switch --QGen, to be used together with --toC or --toAda,
   If --QGen is given, C or Ada code is generated using QGen

For calling from GUI, added menu items
 * 'Generate Ada code with QGen', shortcuts Ctrl-K or F6
 * 'Generate C code with QGen', shortcuts Crl-L or F9

taste authored Apr 26, 2018 and Daniel Tuulik committed May 17, 2018

On laptop, the + is shared with the = keys and requires a shift press.
The built-in ZoomIn event from Qt does not work with shift.

when flattening model, the access to fields was not properly prefixed
for variables declared in substates

to avoid forbidden symbol connections

Only call if md5 of any of the asn1 files has changed

Only propose check if user modified something since last check

V2 is depending on ASN1SCC V4

On some platform, QMessageBox.Discard results in "Close without Saving" instead of "Discard", which is not what is intended here

To make sure user is aware that (s)he is going to enter a subscene

Window for selecting messages was displayed only when clicking from the
Block scene

SEQUENCE OF literal issue reported by IB Krates