Remove FAWE-Piston

Disables a lot of previous functionality in FAWE until replacements can be made. This commit was untested and may cause major issues.

buildSrc/src/main/kotlin/CommonConfig.kt

@@ -13,7 +13,6 @@ fun Project.applyCommonConfiguration() {
         maven { url = uri("https://oss.sonatype.org/content/repositories/snapshots/") }
         maven { url = uri("http://empcraft.com/maven2") }
         maven { url = uri("https://repo.destroystokyo.com/repository/maven-public") }
-        maven { url = uri("https://ci.athion.net/job/FAWE-Piston/ws/") }
         ivy { url = uri("https://ci.athion.net/job")
             patternLayout {
                 artifact("/[organisation]/[revision]/artifact/[module].[ext]")