Update gradle version to 6.5 and klint

* Update `gradle` to `6.5`
* Update `klint` version and add `klint-idea` plugin to generate IDEA specific tasks
* Disable `import-ordering` klint check (see [PR](pinterest/ktlint#527) for details.

Author: vadeg

server/.editorconfig

@@ -8,3 +8,4 @@ insert_final_newline=true
 # possible values: number (e.g. 120) (package name, imports & comments are ignored), "off"
 # it's automatically set to 100 on `ktlint --android ...` (per Android Kotlin Style Guide)
 max_line_length=off
+disabled_rules=import-ordering

server/build.gradle.kts

@@ -1,4 +1,3 @@
-
 import org.jetbrains.dokka.gradle.DokkaTask
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
@@ -18,7 +17,8 @@ plugins {
     id("org.jetbrains.dokka") version "0.10.0" apply false
 
     // We apply this so that ktlint can format the top level buildscript
-    id("org.jlleitschuh.gradle.ktlint") version "7.2.1"
+    id("org.jlleitschuh.gradle.ktlint") version "9.2.1"
+    id("org.jlleitschuh.gradle.ktlint-idea") version "9.2.1"
 }
 
 allprojects {

server/gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.3.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

server/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,21 @@
 #!/usr/bin/env sh
 
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 ##############################################################################
 ##
 ##  Gradle start up script for UN*X
@@ -28,7 +44,7 @@ APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"