Adds improved handling for error messages and later doc on website

lib/core/logging/Icinga_EventLog_Enums.psm1

@@ -0,0 +1,14 @@
+<#
+ # This script will provide 'Enums' we can use for proper
+ # error handling and to provide more detailed descriptions
+ #
+ # Example usage:
+ # $IcingaEventLogEnums[2000]
+ #>
+ [hashtable]$IcingaEventLogEnums += @{
+    'Framework' = @{
+        # TODO: Add event log messages
+    }
+};
+
+Export-ModuleMember -Variable @( 'IcingaEventLogEnums' );

lib/core/logging/Write-IcingaEventMessage.psm1

@@ -0,0 +1,24 @@
+function Write-IcingaEventMessage()
+{
+    param(
+        [int]$EventId      = 0,
+        [string]$Namespace = $null
+    );
+
+    if ($EventId -eq 0 -Or $null -eq $Namespace) {
+        return;
+    }
+
+    $EntryType = $IcingaEventLogEnums[$Namespace][$EventId].EntryType;
+    $Message   = $IcingaEventLogEnums[$Namespace][$EventId].Message;
+
+    if ($null -eq $EntryType -Or $null -eq $Message) {
+        return;
+    }
+
+    Write-EventLog -LogName Application `
+                   -Source 'Icinga for Windows' `
+                   -EntryType $EntryType `
+                   -EventId $EventId `
+                   -Message $Message;
+}