[SHELL32][SYSSETUP] Add Product Options page to ReactOS Setup (#2315)

- Add "Product Options" wizard page into ReactOS Setup.
- Implement CSIDL_Type_InMyDocuments CSIDL type.
- If the product type is workstation, then some special folders will be in My Documents.
CORE-13795

sdk/include/reactos/libs/syssetup/syssetup.h

@@ -44,6 +44,12 @@ typedef struct _TIMEZONE_ENTRY
     ULONG Index;
 } TIMEZONE_ENTRY, *PTIMEZONE_ENTRY;
 
+typedef enum _PRODUCT_OPTION
+{
+    PRODUCT_OPTION_SERVER,
+    PRODUCT_OPTION_WORKSTATION
+} PRODUCT_OPTION, *PPRODUCT_OPTION;
+
 /* Private Setup data shared between syssetup.dll and netshell.dll */
 typedef struct _SETUPDATA
 {
@@ -71,6 +77,8 @@ typedef struct _SETUPDATA
 
     UINT uFirstNetworkWizardPage;
     UINT uPostNetworkWizardPage;
+
+    PRODUCT_OPTION ProductOption;
 } SETUPDATA, *PSETUPDATA;