unity sdk 지원을 위한 리팩토링, 코틀린 제거

Author: ehowlsla

bootpay/build.gradle

@@ -60,7 +60,6 @@ dependencies {
     implementation 'com.github.franmontiel:PersistentCookieJar:v1.0.1'
 
     implementation 'com.google.android.gms:play-services-ads-identifier:16.0.0'
-    implementation 'com.pddstudio:encrypted-preferences:1.3.0'
 
 
     implementation group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib', version: '1.3.21'