Migrate app to native Kotlin

gradlew.bat

@@ -0,0 +1,23 @@
+@if "%DEBUG%"=="" @echo off
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+if defined JAVA_HOME goto findJavaFromJavaHome
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+echo ERROR: JAVA_HOME is not set and no java command could be found. 1>&2
+exit /b 1
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+if exist "%JAVA_EXE%" goto execute
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+exit /b 1
+:execute
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+exit /b %ERRORLEVEL%