feat: allow dots in string attributes and strings in general (#58)

Author: MiriamGaus

uvl/UVLBase.g4

@@ -147,7 +147,7 @@ COMMA: ',';
 ID_NOT_STRICT: '"'~[\r\n".]+'"';
 ID_STRICT: [a-zA-Z]([a-zA-Z0-9_] | '#' | '§' | '%' | '?' | '\\' | '\'' | 'ä' | 'ü' | 'ö' | 'ß' | ';')*;
 
-STRING: '\''~[\r\n'.]+'\'';
+STRING: '\''~[\r\n']+'\'';
 
 SKIP_
   : ( SPACES | COMMENT ) -> skip