fix: dcl build (decentraland#1)

* update to 4.2.1
add DclAndroidPlugin

Author: leanmendoza

.build_version

@@ -1 +1 @@
-4.2.stable
+4.2.1.stable

build/.gitignore

@@ -0,0 +1,36 @@
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Log/OS Files
+*.log
+
+# Android Studio generated files and folders
+captures/
+.externalNativeBuild/
+.cxx/
+*.apk
+output.json
+
+# IntelliJ
+*.iml
+.idea/
+misc.xml
+deploymentTargetDropDown.xml
+render.experimental.xml
+
+# Keystore files
+*.jks
+*.keystore
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Android Profiling
+*.hprof
+
+assets/
+build/