[Build] Move sourceCompatibility option to the root build file

build.gradle

@@ -3,9 +3,14 @@ import tool.UpVersion
 allprojects {
     group 'imgui-java'
     version property('version')
+
     repositories {
         mavenCentral()
     }
+
+    tasks.withType(JavaCompile) {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+    }
 }
 
 tasks.register('upVersion', UpVersion)

buildSrc/src/main/groovy/tool/generator/GenerateLibs.groovy

@@ -1,4 +1,4 @@
-package imgui.generate
+package tool.generator
 
 import com.badlogic.gdx.jnigen.*
 import groovy.transform.CompileStatic

imgui-app/build.gradle

@@ -6,8 +6,6 @@ plugins {
     id 'signing'
 }
 
-sourceCompatibility = 1.8
-
 repositories {
     mavenCentral()
 }

imgui-binding/build.gradle

@@ -1,4 +1,4 @@
-import imgui.generate.GenerateLibs
+import tool.generator.GenerateLibs
 
 plugins {
     id 'java'
@@ -7,8 +7,6 @@ plugins {
     id 'signing'
 }
 
-sourceCompatibility = 1.8
-
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.5.2'
     testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.5.2'

imgui-lwjgl3/build.gradle

@@ -5,8 +5,6 @@ plugins {
     id 'signing'
 }
 
-sourceCompatibility = 1.8
-
 dependencies {
     implementation platform("org.lwjgl:lwjgl-bom:3.2.3")