Build script cleanup/updates.

build.gradle.kts

@@ -21,6 +21,6 @@ if (!project.hasProperty("gitCommitHash")) {
     } catch (e: Exception) {
         logger.warn("Error getting commit hash", e)
 
-        "no_git_id"
+        "no.git.id"
     }
 }

buildSrc/src/main/kotlin/CommonConfig.kt

@@ -7,7 +7,7 @@ fun Project.applyCommonConfiguration() {
 
     repositories {
         mavenCentral()
-        maven { url = uri("https://maven.sk89q.com/repo/") }
+        maven { url = uri("https://maven.enginehub.org/repo/") }
         maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots/") }
     }
     configurations.all {

buildSrc/src/main/kotlin/PlatformConfig.kt

@@ -28,7 +28,7 @@ fun Project.applyPlatformAndCoreConfiguration() {
     apply(plugin = "com.jfrog.artifactory")
     apply(plugin = "net.minecrell.licenser")
 
-    ext["internalVersion"] = "$version;${rootProject.ext["gitCommitHash"]}"
+    ext["internalVersion"] = "$version+${rootProject.ext["gitCommitHash"]}"
 
     configure<JavaPluginConvention> {
         sourceCompatibility = JavaVersion.VERSION_1_8