[WIP] Maven: building native code

[mstrap]

I've now included building of the native libraries for Windows in the pom.xml:

• should we take this approach in general? Then I'll add configurations for Mac and Linux, too.
• should we build both 32-bit and 64-bit binaries at the same time or instead have the target platform configurable in build.properties?
• should we package the libraries into JARs and adjust NativeLoader to (optionally) uncompress the libraries to a temporary directory and load from there? I know this from SWT and JNA and I think it would fit well to Maven's philosophy, too.