fix bug causing cmdtab to stop remembering new window activations

fix crash when invoked with 0 windows
remove show delay and "ignore minimized" non-feature
change icon to vibrant blue to suit both light and dark themes
ensure msgbox gets kbd focus
some code cleanup
remove comments

res/cmdtab.rc

@@ -1,6 +1,6 @@
 1 VERSIONINFO
-	FILEVERSION		1,5,0,0
-	PRODUCTVERSION	1,5,0,0
+	FILEVERSION	1,5,1,0
+	PRODUCTVERSION	1,5,1,0
 	FILEFLAGSMASK	0x3FL
 	#ifdef _DEBUG
 	FILEFLAGS		0x1L
@@ -19,17 +19,17 @@
 		{
 			BLOCK "040904B0"
 			{
-				VALUE "Comments",			"N/A"
+				VALUE "Comments",		"N/A"
 				VALUE "CompanyName",		"Stian Gudmundsen Høiland"
 				VALUE "FileDescription",	"macOS-style Alt-Tab window switcher alternative"
-				VALUE "FileVersion",		"1.5"
+				VALUE "FileVersion",		"1.5.1"
 				VALUE "InternalName",		"cmdtab"
 				VALUE "LegalCopyright",		"Copyright (C) 2023 Stian Gudmundsen Høiland"
 				VALUE "LegalTrademarks",	"N/A"
 				VALUE "OriginalFilename",	"cmdtab.exe"
 				VALUE "PrivateBuild";		"N/A"
 				VALUE "ProductName",		"cmdtab"
-				VALUE "ProductVersion",		"1.5"
+				VALUE "ProductVersion",		"1.5.1"
 				VALUE "SpecialBuild",		"N/A"
 			}
 		}