Adds a screen that prompts for the inputs needed for calibration.

We needed to add Lemur back in as a dependency in order to properly port this. We'll remove it again in a future commit.

build.gradle

@@ -20,10 +20,11 @@ plugins {
 
 repositories {
     jcenter()
+    maven {
+        url  "https://dl.bintray.com/jmonkeyengine/org.jmonkeyengine"
+    }
 }
 
-sourceCompatibility = "1.8"
-targetCompatibility = "1.8"
 [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
 
 ext {
@@ -40,6 +41,8 @@ dependencies {
     implementation "${jme3.g}:jme3-core:${jme3.version}"
     implementation "${jme3.g}:jme3-desktop:${jme3.version}"
     implementation "${jme3.g}:jme3-lwjgl3:${jme3.version}"
+    implementation "org.codehaus.groovy:groovy-all:2.4.5"
+    implementation "com.simsilica:lemur:1.14.0"
 }
 
 // Define the main class for the application