Better Optimized and Fixed Riften Meshes

Many of Skyrims meshes are not made well. These meshes contain a lot of unnecessary vertices/triangles, stretched UVs, missing vertices/faces, bad vertex colors and/or normals, and obvious texture seams. I made the decision to go through all of Skyrim's meshes and fix the worst of them (mostly architecture and dungeon meshes) and share them with those that are interested

This will be the first part of that project; starting with Riften. Riften is notorious for being one of, if not the, most poorly performing cities in the game. While there are others means to improve performance (smaller textures, occlusion planes, lower poly models), one most overlooked is optimization of the models vertex/triangle counts. While doing this does have the lowest impact when improving performance, it does so nevertheless; with the largest difference will be on lower end hardware. Riften's meshes have had their vertex counts reduced by at least 35%, with some upwards of 70%, and retaining the meshes shape. While optimizing, I also fixed any of the mentioned issues above when they were found. The work I have done is not perfect, but it is better than vanilla.