Improve robustness of command-line parameters

The encoder or decoder application prints out a message if the number of command-line parameters is wrong or something is missing. On the other hand, a confusing message is printed e.g. when metadata is not present for ISM format, a letter character is used when a number is expected, etc.

E.g. calling of

ivas_cod.exe -ism 2 48000 48 inp bit

returns

Error: Number of ISM channels not specified!

This ticket intends to improve the print-out when command-line parameters are wrong.