Various improvements to packaging

This fixes several issues I had with consuming multi-loader CC:T in
various upstream mods.

 - Include /all/ sources in the Forge/Fabric jar. Before it was just the
   common classes, and not the core or API.

 - Use some Gradle magic to remove superfluous dependencies from the POM
   file. Also make sure Cobalt and Netty are present as dependencies.

 - Start using minimize() in our shadow jar config again.

projects/fabric-api/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
-    id("cc-tweaked.publishing")
     id("cc-tweaked.fabric")
+    id("cc-tweaked.publishing")
 }
 
 val mcVersion: String by extra