Add timezone-conversion and dashboard-widget SQL functions; remove obsolete backup__ copies

Add datetime_LocalToUTC / datetime_utcToLocal, and two widget query
functions (fds_wdg_MFRSync, fds_wgd_lastEmails). Remove the unreferenced
backup__fds__* function files superseded by their current counterparts,
and suppress SQL71501 (unresolved cross-database/composite references)
project-wide.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Fuchs_Database/dbo/Functions/datetime_LocalToUTC.sql

@@ -0,0 +1,26 @@
+
+
+
+-- =============================================
+-- Author:		Dr. Stefan Ott
+-- Create date: <Create Date, ,>
+-- Description:	<Description, ,>
+-- =============================================
+CREATE FUNCTION [dbo].[datetime_LocalToUTC]
+(
+	@datetime datetime
+	,@timezone varchar(50) = null
+)
+RETURNS datetime
+AS
+BEGIN
+	DECLARE @Ret datetime;
+
+	IF @datetime is null
+		SET @RET = null;
+	ELSE
+		SET @RET = @datetime AT TIME ZONE ISNULL(@timezone, 'Central European Standard Time') AT TIME ZONE 'UTC'
+
+	RETURN @RET;
+
+END