added javadocJar and sourcesJar

[nbauma109]

I find it helpful to have source attachment when using the jar as a dependency. All the procyon-* jars come with sources and javadoc except procyon-decompiler. With this change procyon-decompiler will also come with sources and javadoc with jitpack https://jitpack.io/#mstrobel/procyon/v0.6.0. Build with sources and javadoc here : https://jitpack.io/com/github/nbauma109/procyon/sources-javadoc-9d951d78e1-1/build.log

[nbauma109]

Building sources jar is not this trivial since it's a fat jar.
Coming back later to update.

[nbauma109]

Building sources jar is not this trivial since it's a fat jar. I might come back later to update.

With this update 'added all sources to fat jar', I added the sources of projets core and compilertools to the fat jar procyon-decompiler.jar

[nbauma109]

Hi @mstrobel
Please help moving forward with this PR
Thanks !