personal/q3k: add minecraft plugins

Also drive-by modify WORKSPACE to add required deps.

Also drive-by update deps in WORKSPACE.

Also drive-by remove old stackb/proto library from WORKSPACE (only used
in cccampix, which is dead, and stackb/proto should be replaceable by
the main grpc lib by this point).

Change-Id: I7ac7fe2237e859dc1c45bf41a016174ed8e9ee71
diff --git a/personal/q3k/minecraft/plugin/example/Main.java b/personal/q3k/minecraft/plugin/example/Main.java
new file mode 100644
index 0000000..a67ee78
--- /dev/null
+++ b/personal/q3k/minecraft/plugin/example/Main.java
@@ -0,0 +1,15 @@
+package hscloud.personal.q3k.minecraft.plugin.example;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class Main extends JavaPlugin {
+    @Override
+    public void onEnable() {
+        System.out.println("enabled");
+    }
+
+    @Override
+    public void onDisable() {
+        System.out.println("disabled");
+    }
+}