Rewrite to kotlin (#185)

Enjoy Kotlin!

.editorconfig

@@ -0,0 +1,7 @@
+[*.{kt,kts,java}]
+indent_size=2
+max_line_length=off
+insert_final_newline=true
+
+[*.{kt,kts}]
+kotlin_imports_layout=ascii

.github/workflows/gradle-build.yml

@@ -0,0 +1,13 @@
+name: "Gradle build"
+on: [push, pull_request]
+
+jobs:
+  gradle:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Gradle
+        run: ./gradlew build

.gitignore

@@ -48,6 +48,9 @@ captures/
 .idea/modules.xml
 .idea/navEditor.xml
 .idea/markdown*
+.idea/compiler.xml
+.idea/inspectionProfiles/Project_Default.xml
+.idea/jarRepositories.xml
 projectFilesBackup/
 
 # Keystore files