update preprocessor, switch to maven central

build.gradle

@@ -13,7 +13,7 @@ ext {
 application.mainClassName = "${mainClassName}"
 
 repositories {
-    jcenter()
+    mavenCentral()
 }
 
 dependencies {
@@ -142,5 +142,4 @@ jastadd {
 }
 
 clean.dependsOn(cleanGen)
-
-generateAst.dependsOn relast
+generateAst.dependsOn(relast)

relast.preprocessor @ 7959fd58

-Subproject commit 12668fd8c2e4eee20000d1e7b43b2d4d17c59d45
+Subproject commit 7959fd58f90538a7d8751855a61f69ba775bc82c