* Add support for compiling sources at runtime.
Supported languages for now: C#, Boo, Nemerle, VB.NET (this one doesn't quite work yet - the compiler seems to be buggy).
The first non-blank line in the mainscript file needs to be a comment in the form
// language:csharp references:System.Xml sources:otherfile.cs

'meta-comments' for different languages look equivalent.

By default references for qt-dotnet, kde-dotnet and plasma-dll are added.
The default language is C#, the default source file is only 'main'.
So if a script is written in C#, only needs qt, kde and plasma bindings and all the code is contained in 'main', this comment can be omitted.

For each source file a md5 hash is created so it's only recompiled if the source was modified.