Mining (Skills, Crafting, Stats, Sell Minerals, & Custom Models)

UPDATE

1. Added primary keys to the database, so they can be edited in-game SQLWorkbench.
2. Added can afford logic to the clientside of the skills menu, so it won't visually upgrade if you have no money.
3. Added denied/approved sounds when updating skills in menu.

Updated files: client/vgui/ch_mining_menu_skills.lua and server/sql/ch_mining_sql_functions.lua