feature(fabric): added fabric support (#491)

* Initial work towards Fabric compat. This does not compile yet

* Further updates - should compile but Gradle is being weird.

* Remove useless buildscript extras

* Added mixins to buildscript classpath to fix Loom crash

* Make it compile

* Got it building and added interaction

* Fixed review comments

* Use ServerPlayerEntity for FakePlayer

* Use method references for nicer names

* Fixed remaining comments and added networking for CUI

* Output as dist.jar

* Added mixins for left click air

* Use regex for cleanliness

build.gradle

@@ -30,7 +30,7 @@ println """
  1) Read COMPILING.md if you haven't yet
  2) Try running 'build' in a separate Gradle run
  3) Use gradlew and not gradle
- 4) If you still need help, ask on IRC! irc.esper.net #sk89q
+ 4) If you still need help, ask on Discord! https://discord.gg/enginehub
 
  Output files will be in [subproject]/build/libs
 *******************************************
@@ -85,7 +85,7 @@ subprojects {
     }
 }
 
-configure(['core', 'bukkit', 'forge', 'sponge'].collect { project(":worldedit-$it") }) {
+configure(['core', 'bukkit', 'forge', 'sponge', 'fabric'].collect { project(":worldedit-$it") }) {
     apply plugin: 'java'
     apply plugin: 'maven'
     apply plugin: 'checkstyle'
@@ -118,7 +118,7 @@ configure(['core', 'bukkit', 'forge', 'sponge'].collect { project(":worldedit-$i
         archives javadocJar
     }
 
-    if (!(name.equals('worldedit-forge') || name.equals('worldedit-sponge'))) {
+    if (name == "worldedit-core" || name == "worldedit-bukkit") {
         task sourcesJar(type: Jar, dependsOn: classes) {
             classifier = 'sources'
             from sourceSets.main.allSource
@@ -144,7 +144,7 @@ configure(['core', 'bukkit', 'forge', 'sponge'].collect { project(":worldedit-$i
     }
 }
 
-configure(['bukkit', 'forge', 'sponge'].collect { project(":worldedit-$it") }) {
+configure(['bukkit', 'forge', 'sponge', 'fabric'].collect { project(":worldedit-$it") }) {
     shadowJar {
         classifier 'dist'
         dependencies {