Update so many dependencies, merge Forge/Fabric for final jar (#1651)

* Update so many dependencies, merge Forge/Fabric for final

* Clean up contrib docs for Gradle change

* Fix setting compat flags while using toolchain

* Fix deprecation in doc printer

* Restore proper forge JAR name

* Add dist classifier for mod jar

* Properly relocate new bStats

* Fix jar used from fabric

* Fix fabric bom

* Dup the shaded classes for consistency

* Sync Forge/Fabric log4j versions, de-dup

* Downgrade both log4j. This will work

* Update some plugins as well

* Drop the fabric force stuff

* Use duplicate strategy to directly merge jar

worldedit-core/doctools/build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    kotlin("jvm") version "1.4.0"
+    kotlin("jvm") version "1.4.21"
     application
 }
 
@@ -11,7 +11,7 @@ tasks.withType<KotlinCompile> {
     kotlinOptions.jvmTarget = "1.8"
 }
 
-application.mainClassName = "com.sk89q.worldedit.internal.util.DocumentationPrinter"
+application.mainClass.set("com.sk89q.worldedit.internal.util.DocumentationPrinter")
 tasks.named<JavaExec>("run") {
     workingDir = rootProject.projectDir
 }
@@ -21,5 +21,5 @@ dependencies {
     "implementation"(project(":worldedit-core"))
     "implementation"(kotlin("stdlib-jdk8"))
     "implementation"(kotlin("reflect"))
-    "implementation"("com.google.guava:guava:21.0")
+    "implementation"("com.google.guava:guava")
 }