v1.9.0

• BREAKING CHANGE: CheckPermission returns bool instead of Permission (see yasirkula/UnityAndroidRuntimePermissions#14)
• BREAKING CHANGE: Replaced RequestPermission with RequestPermissionAsync (see #343)
• BREAKING CHANGE: Removed CanOpenSettings since it's now always true
• Updated Unity version to 2021.3.41f1 (simplified codebase accordingly)
• iOS frameworks are now added properly instead of changing OTHER_LDFLAGS
• Fixed Xcode compiler warnings