feat: implement steam api wrapper

[craftablescience]

• [x] Use LibLoader to hook into Steam API functions
  • [x] Init/shutdown methods
  • [x] User methods
  • [x] Friends methods
  • [x] Utils methods
  • [x] Apps methods
  • [x] Set up basic manual callback handler
• [x] Refactor root cmake, allow clang to compile dynamic libraries
• [x] Update dependencies
• [x] Minor usability and stability improvements

[craftablescience]

This was actually merged by yours truly ;)