Add UpdateFlags injection

[naeem76]

PR for #101

I have just started looking into Cities modding, so apologies if there's any issue, I'm planning to contribute more if things go well.

Tested with 2 local instances of cities, and abandoned buildings were synced.

[naeem76]

No probs on the time, I did some more testing afterwards, and in extreme scenarios it is a bit desynced, because server and client are doing their own thing, probably need to cancel any client side actions for these. I tried using harmony to skip original method when client side, but not working great. I'll check later when i have more time!