Fixes#4646
Switches AppVeyor build worker image to Visual Studio 2015.
Fixed a bug with serv.bat, since crashes would result in a negative number sometimes, the crash would not be detected and would not be reported.
Thanks to @aleos89
* Added the custom and test scripts to the buildbot
All scripts inside the custom and test npc directory are now parsed and executed automatically by the buildbot.
The only exceptions are the custom battleground scripts that would cause duplication warnings.
Thanks to @Jeybla for the Unix script!
Now builds will fail if any warnings or errors occur.
Removed duplicated "matrix" keyword I added accidentally in 3108bb1.
Removed a default warning in run once mode in the character server. Follow up to a0b3e51