Add beta number to the about window #694

Job	Run time
Build-Wart	30s
Build-OpenWatcom19-OS2	39s
C-Kermit-Linux-Build-Test	1m 18s
Get-CACerts-Bundle	5s
Prepare-Docs	18s
Build-MinGW64-Linux	2m 27s
Build-OpenWatcom19-Win32-NT-legacy	1m 26s
Build-OpenWatcom19-Win32	1m 30s
Build-VCT2003-PSDK2003 (yes)	1m 37s
Build-VCT2003-PSDK2003 (no)	1m 27s
Build-VisualCxx (x86, 14)	17m 58s
Build-PSDK2003SP1-IA64	1m 4s
Build-PSDK71 (ia64)	3m 51s
Build-VisualCxx (x86, 14.2)	17m 33s
Build-VisualCxx (x86, 14.3)	18m 43s
Build-VisualCxx (x64, 14)	1m 39s
Build-VisualCxx (x64, 14.2)	1m 44s
Build-VisualCxx (x64, 14.3)	1m 39s
Build-VisualCxx (x64_arm, 14.3)	1m 35s
Build-VisualCxx (x64_arm64, 14.3)	1m 41s
	1h 18m 44s

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