Scala version was not correctly retrieved

[maris123]

I encountered a problem while testing the compiler using different modules with different Scala versions. One of the modules was using a Scala SDK that was installed on my system (not downloaded by Ivy).

The compiler classpath contains jars that do not have the Scala version in their name. So in this case we can take the version from the SDK name.

[dotta]

In the IJ Scala support there is already some code for extracting the version from the compiler.properties which is shipped with every scala-compiler.jar. We should do the same instead of reading the SDK name.