Print short description of each error at end of compile log

[wyozi]

Prints short description for each error that happened.

Example log output:

2 errors/warnings logged:
(1) - Can't load skybox file [sub:1] to build the default cubemap! (Caution)
(2) - fastvis = true (Info)

The way I use to parse the short description is a bit weird (HTML & Regex anyone), but seems to work for error messages I tried.

[ruarai]

Very useful! Hopefully the html regex demons do not appear.