Application Configuration for Gradle

Added the "Application" plugin to the client and server projects,
which already use it to start their respective programs. Also, makes
the client application run by default when executing the 'run' task in
the base project.

build.gradle

@@ -5,6 +5,7 @@ plugins {
 
 allprojects {
     apply plugin: "java"
+    apply plugin: "application"
 
     version = "2.2.1-dev2"
 
@@ -81,6 +82,11 @@ dependencies {
     implementation project(":client")
 }
 
+// Running the root project actually just runs the client project
+application {
+    mainClass = 'minicraft.core.Game'
+}
+
 // Build a runnable game distribution.
 jar {
     manifest {