feature/programming-language-versioning

Users do not like incompatible changes of versions in a programming language or libraries. Expecially if this requires conversion of old code, used in production. Every company loose customers when this happen. For example Microsoft, KDE, Elm, etc…

In Dok:

every file specifies the version of Dok language used
there are automatic converter converting old Dok code to new code
the libraries can do the same and convert old library API to new version

Every library specifies these versions:

list of supported API in an automatic way
implementation version