Changes:
Ada is case insensitive
Added 'Parallel' reserved word
Identifiers may not begin or end with underscore
Support for identifiers containing digits
Support for Ada specifications file (subprogram declaration) (#14687)
Support for dot notation within types (#14908)
Support for generic instantiations (#14498) (functions with no return statement)
Fix#14908, fix#14687, fix#14498, close#14986
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