Feature required: Inject Facebook SDK version dynamically with engine version

[pandamicro]

ANDROID_VERSION_PATH = '/CUI/facebook-android-sdk/facebook/src/com/facebook/FacebookSdkVersion.java'
IOS_VERSION_PATH = '/CUI/facebook-ios-sdk/src/FacebookSDK.h'

For Android it looks like this:

final class FacebookSdkVersion {
    public static final String BUILD = "3.18.0/Cocos2d-x-v3.3";
    // public static final String BUILD = "3.18.0/Cocos2d-JS-v3.1";
    // public static final String BUILD = "3.18.0/Cocos2d-Lua-v3.3";
}

For iOS:

#define FB_IOS_SDK_VERSION_STRING @“3.18/Cocos2d-x-v3.3"
// #define FB_IOS_SDK_VERSION_STRING @"3.18/Cocos2d-JS-v3.1"
// #define FB_IOS_SDK_VERSION_STRING @"3.18/Cocos2d-Lua-v3.3"