Set ErrorActionPreference to "Stop".

This is required to correctly propagate exceptions from function calls.
Otherwise every call has to specify the "-EA" flag explicitly.

Refers to #28

Updater/Update-Service.ps1

@@ -473,6 +473,7 @@ function Log-Debug([string]$Message) {
 ################################################################################
 
 
+$ErrorActionPreference = "Stop"
 
 try {
     . $UpdaterSettings