Add new PrebuiltNetworkTile class

[h3ndofry]

I've made a start on this in my fork, but there is a specific save file exemplar for prebuilt (aka, 3D) network items (such as Elevated Highway and Monorail) located in the save file.

0x49C1A034 is the subfile, and it should be roughly the same format as what's already done for NETWORK_SUBFILE_1 except it has to deal with a 3d object so some byte offsets may be different.

More info can be found on the SC4D wiki at the bottom of the page. https://www.wiki.sc4devotion.com/index.php?title=Network_Subfiles

[Killeroo]

Brilliant, good find. This explains some of the missing network tiles that I was seeing before. Can't believe I didn't see that file hiding at the bottom of the page :)

[h3ndofry]

No worries!

Let me know if you get stuck - I can grab some additional data from the game for testing as part of our NAM experiments.