Clean gradle scripts

buildSrc/src/main/kotlin/be/simplenotes/base.gradle.kts

@@ -1,57 +1,9 @@
 package be.simplenotes
 
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
-    java
-    kotlin("jvm")
-    `java-library`
+    id("be.simplenotes.java-convention")
+    id("be.simplenotes.kotlin-convention")
+    id("be.simplenotes.junit-convention")
     id("org.jlleitschuh.gradle.ktlint")
-}
-
-repositories {
-    mavenLocal()
-    mavenCentral()
-    jcenter()
-    maven { url = uri("https://dl.bintray.com/arrow-kt/arrow-kt/") }
-    maven { url = uri("https://kotlin.bintray.com/kotlinx") }
-}
-
-group = "be.simplenotes"
-version = "1.0-SNAPSHOT"
-
-dependencies {
-    implementation(kotlin("stdlib-jdk8"))
-    implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.4.10"))
-}
-
-tasks.withType<Test> {
-    useJUnitPlatform()
-}
-
-java {
-    sourceCompatibility = JavaVersion.VERSION_14
-    targetCompatibility = JavaVersion.VERSION_14
-}
-
-sourceSets {
-    val test by getting
-    test.resources.srcDir("${rootProject.projectDir}/simplenotes-test-resources/src/test/resources")
-}
-
-tasks.withType<KotlinCompile> {
-    kotlinOptions {
-        jvmTarget = "14"
-        javaParameters = true
-        freeCompilerArgs = listOf(
-            "-Xinline-classes",
-            "-Xno-param-assertions",
-            "-Xno-call-assertions",
-            "-Xno-receiver-assertions"
-        )
-    }
-}
-
-tasks.withType<JavaCompile> {
-    options.encoding = "UTF-8"
+    id("com.github.ben-manes.versions")
 }