Remove gdx-box2d from build files because it isn't used (#2595)

* Remove box2d from build files because it isn't used

* Remove some unused includes to make the build work

android/proguard-rules.pro

@@ -24,7 +24,6 @@
 -dontwarn android.support.**
 -dontwarn com.badlogic.gdx.backends.android.AndroidFragmentApplication
 -dontwarn com.badlogic.gdx.utils.GdxBuild
--dontwarn com.badlogic.gdx.physics.box2d.utils.Box2DBuild
 -dontwarn com.badlogic.gdx.jnigen.BuildTarget*
 
 -keep class com.badlogic.gdx.controllers.android.AndroidControllers
@@ -32,13 +31,3 @@
 -keepclassmembers class com.badlogic.gdx.backends.android.AndroidInput* {
    <init>(com.badlogic.gdx.Application, android.content.Context, java.lang.Object, com.badlogic.gdx.backends.android.AndroidApplicationConfiguration);
 }
-
--keepclassmembers class com.badlogic.gdx.physics.box2d.World {
-   boolean contactFilter(long, long);
-   void    beginContact(long);
-   void    endContact(long);
-   void    preSolve(long, long);
-   void    postSolve(long, long);
-   boolean reportFixture(long);
-   float   reportRayFixture(long, float, float, float, float, float);
-}

build.gradle

@@ -38,7 +38,6 @@ allprojects {
 
         gdxVersion = '1.9.10'
         roboVMVersion = '2.3.1'
-        box2DLightsVersion = '1.4'
         ashleyVersion = '1.7.0'
         aiVersion = '1.8.0'
     }
@@ -66,7 +65,6 @@ project(":desktop") {
         implementation project(":core")
         implementation "com.badlogicgames.gdx:gdx-backend-lwjgl:$gdxVersion"
         implementation "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop"
-        implementation "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-desktop"
 
         implementation "com.badlogicgames.gdx:gdx-tools:$gdxVersion"  // This is for the TexturePacker class
         implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" // This iss so the JAR works with Kotlin
@@ -92,12 +90,6 @@ project(":android") {
         natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-arm64-v8a"
         natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86"
         natives "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86_64"
-        implementation "com.badlogicgames.gdx:gdx-box2d:$gdxVersion"
-        natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi"
-        natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-armeabi-v7a"
-        natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-arm64-v8a"
-        natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86"
-        natives "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-x86_64"
     }
 }
 
@@ -112,7 +104,6 @@ project(":ios") {
         implementation "com.mobidevelop.robovm:robovm-cocoatouch:$roboVMVersion"
         implementation "com.badlogicgames.gdx:gdx-backend-robovm:$gdxVersion"
         implementation "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-ios"
-        implementation "com.badlogicgames.gdx:gdx-box2d-platform:$gdxVersion:natives-ios"
     }
 }
 
@@ -122,7 +113,6 @@ project(":core") {
 
     dependencies {
         implementation "com.badlogicgames.gdx:gdx:$gdxVersion"
-        implementation "com.badlogicgames.gdx:gdx-box2d:$gdxVersion"
         implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion"
     }
 

core/src/com/unciv/logic/GameStarter.kt

@@ -1,7 +1,6 @@
 package com.unciv.logic
 
 import com.badlogic.gdx.math.Vector2
-import com.sun.xml.internal.bind.v2.runtime.reflect.opt.Const
 import com.unciv.Constants
 import com.unciv.logic.civilization.CivilizationInfo
 import com.unciv.logic.map.*

core/src/com/unciv/ui/utils/ImageGetter.kt

@@ -12,7 +12,6 @@ import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.scenes.scene2d.utils.Drawable
 import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable
 import com.badlogic.gdx.utils.Align
-import com.sun.xml.internal.bind.v2.runtime.reflect.opt.Const
 import com.unciv.Constants
 import com.unciv.models.ruleset.Nation
 import com.unciv.models.ruleset.Ruleset