Wrong idea: ManagedCompiler

Well, it looks like I seldom find the right choice in this project. The ManagedCompiler was a really bad idea to use in the MSBuild task:

• it allows to use only a single version of Scala
• the dlls used cannot be freed
• it cannot be deployed unless the dlls are merged in one dll (not too feasible), or the dlls are signed (not the case currently)

I was aware only the first problem, but I thought it is not a huge problem to deploy a new version of Scala MSBuild task for each version of Scala, although the other problems made it really wrong idea. (I hoped that the ManagedCompiler would make the error reporting easier and the compilation faster. Well, this shall not happen soon.)