Add documentation to dev.plex.admin, dev.plex.banning, dev.plex.cache, and dev.plex.command (annotations and PlexCommand.java only)

Convert Date in punishments to LocalDateTime

build.gradle

@@ -74,4 +74,8 @@ tasks {
     build {
         dependsOn(shadowJar)
     }
+
+    javadoc {
+        options.memberLevel = JavadocMemberLevel.PRIVATE
+    }
 }