Add support of loading loading and displaying LOD assets purely based on their filename extension
This specifically targets !1861 (merged) which started doing the work as outlined here !1287 (comment 943489605)
So while that list covered a LOT of ground, let's start smart and focus on having the bare minimal needed for making OpenMW aware. The goal is not be refined and refer to ESM's flags, that is handled in #6978; but for the purposes of getting MGE:XE LOD working and supporting later game's assets; we have to support all their suffixes.
What should be supported:
- loading MGE:XE LOD assets based on suffixes
- loading Oblivoin LOD assets based on suffixes
- loading Skyrim LOD assets based on suffixes
- OP/AG should be in the loop here, using best guess... in AG area, the original asset is to be used; outside of AG, the LOD asset.
Note: There might be multiple level of LOD. I'm okay with just having the most simple LOD being used in the distance. If it can be handled in a 'smart' way, we can support multiple levels based on units away from the player. We can create a ticket to handle this feature if necessary as it might require use of various flags in the ESM.
Once this in place, we can build on top of it to include other things.