Better Map Textures - Natural HD Textures for III

About 30 textures converted so far, including roads, billboards, posters and some other misc/environmental.

I haven't exactly figured out how to replace textures without resizing these to the DE textures. As a result, some have been downscaled compared to the original mod. Despite this, I feel like it restores some of the classic feel to this edition in a noticeable way.

I thought I'd put this out there early while I (and the modding community as a whole) spend some time learning how to mod UE4 more effectively.