Will not error if the library usermessage is removed.

Now it inspects the default scene rendering as well.

Added a small check to restore ENTs and SWEPs in order to prevent restoring missing ENTs or SWEPs.

- Some cleanup + more returned values.
- Impacts >1000% are now properly displayed.
- ENT and SWEP functions are now inspected.

Added support for timers.

Improved impact calculation: for hooks called less often than framerate, impact is increased like it is called at the framerate.

English mistake

Replaced the impact calculation again. Now only the mean execution time is used because the max execution time is not reliable. That is a problem with long capture periods.

- Changed impact calculation and display.
- Replaced the total time with the mean time per frame.