Allow `import "."` in SCL
Allow use of import "."
statements in SCL in order to refer to a parent module or a parent library as an ontology.
Currently SCL treats "." as an invalid relative reference.
This is especially useful for referring to a user component from modules inside it without using any references to the name of the module. Avoiding direct reference to the name of the component is helpful in avoiding SCL code changes due to versioning.