this version adds basic support for the newtype construct, allowing to
define internal types using the SDL syntax.
only support definition of array types:
newtype MyType
array (SomeInteger, SomeType)
endnewtype;
this will be transformed into:
MyType ::= SEQUENCE (SIZE (minOfSomeInteger .. maxOfSomeInteger)) OF
SomeType

not complete, the gpr for SDL must call opengeode to generate Ada with
all input files in one go, not one call per file

Due to the AST storing now the full path of the ASN.1 files

as per ISS request

These allow to cast from/to a CHOICE discriminant and an ENUMERATED type
containing exactly the same list of enumerants

Qgen

See merge request !4