Revert "updated SDK to v1.7.12, fixed gradlew in core sdk, updated android sdk to latest version of gradle, made android sdk able to deploy aar to local maven repo"

This reverts commit 29d55ea352cc0bfea09cf4695600cb932edd4aa8.
Revert "updated SDK to v1.7.12, fixed gradlew in core sdk, updated android sdk to latest version of gradle, made android sdk able to deploy aar to local maven repo"

This reverts commit 9d7a91fbe4a45cb2bc9f7895af160a34db84f868.
Revert "updated SDK to v1.7.12, fixed gradlew in core sdk, updated android sdk to latest version of gradle, made android sdk able to deploy aar to local maven repo"

This reverts commit cab67255fb70574ccb1c4a45e838f492b9094477.