Issue#7 Conversion for Language Level Type

[ThiBruUU]

fixes issue #7

Adds some functions as a quickfix to convert the existing feature model into a feature model suitable for the included language levels if language levels are missing (Type, Type.numeric-constraints, Type.string-constraints).

[SundermannC]

On my system, it seems like the changes are not really robust.
Especially when having constraints and features that illegally use type level, UVLS crashed entirely or shows this message often:

It won't leave this state and UVLS appears to be much slower during it. For instance, UVLS requires multiple seconds for a single autocomplete. While it is not 100% deterministic, it happens most of the time for me.

With the master branch, the crashes do not seem to happen for me.

Here is the model:

include
    Boolean
    Arithmetic

features
    Root {Numeric 25}
    Fun {String ''}
    Real noFun

constraints
    noFun > 3

Does this issue occur for you as well?

[MartinMUU]

On my system the changes seem to work as intended. Also the example model is working correctly.

[SundermannC]

Strange, did you make edits? For me, I can perform quick fixes initially sometimes, but problems occur consistently within a few small changes.

Could this be related to the OS? Did you introduce any changes to implementation using file system operations?

[MartinMUU]

I tested it again with a lot of changes and edits, but I still can't reproduce the bug. I tested it on Windows.
We did not change anything in relation to the file System as far as I know.