-Renamed all model files with Upper-Case (or capital) Letters to Lower-Case letters.

Apparently, all the models with capital letters were showing up as errors (not for me though). I found this was because of the capital letters. In the case for Linux users, Gmod's workshop can't have any upper case letters in any of the models' names. Never again will I give any of my models capital letters, unless its personal (because I don't get errors).