feat(lexicon): moving out from unstable

[ArtificialOwl]

• moving UserConfig+Lexicon out of unstable into public:

NCU\Config\Lexicon\ConfigLexiconEntry; => OCP\Config\Lexicon\Entry
NCU\Config\Lexicon\ConfigLexiconStrictness => OCP\Config\Lexicon\Strictness
NCU\Config\Lexicon\IConfigLexicon =>OCP\Config\Lexicon\ILexicon
NCU\Config\ValueType => OCP\Config\ValueType
NCU\Config\Exceptions\IncorrectTypeException => OCP\Config\Exceptions\IncorrectTypeException
NCU\Config\Exceptions\IncorrectTypeException => OCP\Config\Exceptions\TypeConflictException
NCU\Config\Exceptions\IncorrectTypeException => OCP\Config\Exceptions\UnknownKeyException
NCU\Config\IUserConfig => OCP\Config\IUserConfig
NCU\Config\ValueType => OCP\Config\ValueType

• removing Preset::EDUCATION
• adding Preset::SCHOOL and Preset::UNIVERSITY
• marking previous code from unstable as deprecated
• Config Lexicon documentation#12982

[nfebe]

LGTM

[susnux]

New code probably needs the attributes setup for interfaces