Pull Request

- fixed some compiler warnings (#963)
- fixed team colors
- fixed picker/sliders behavior when several skin parts are selected
- fixed so we can't change the color of one of the selected skin parts if it isn't using custom colors
- fixed tattoo alpha with team colors
- fixed cl_customize_skin variable description
- made so we can mirror some skin parts
- made a cool function to know if a skin part is using alpha
- fixed mirrored variable net type
- fixed so the new skin is added to the list after saving it
- fixed some gui overlapping issues in skin settings