[SHELL32][SDK] Implement RealShellExecute(,Ex)(A,W) (#5849)

Implementing missing features...
JIRA issue: CORE-19278
- Modify shell32.spec.
- Implement RealShellExecuteA, RealShellExecuteW, RealShellExecuteExA,
  and RealShellExecuteExW functions.
- Add the prototypes to <undocshell.h>.
- Modify SEE_MASK_... constants.

sdk/include/psdk/shellapi.h

@@ -37,7 +37,7 @@ extern "C" {
 #define SEE_MASK_UNICODE	0x00004000
 #define SEE_MASK_NO_CONSOLE	0x00008000
 /*
- * NOTE: The following three flags are undocumented and are not present in the
+ * NOTE: The following 5 flags are undocumented and are not present in the
  * official Windows SDK. However they are used in shobjidl.idl to define some
  * CMIC_MASK_* flags, these ones being mentioned in the MSDN documentation of
  * the CMINVOKECOMMANDINFOEX structure.
@@ -45,9 +45,11 @@ extern "C" {
  * course their values may differ from the real ones, however I have no way
  * of discovering them. If somebody else can verify them, it would be great.
  */
-#define SEE_MASK_HASLINKNAME	0x00010000
-#define SEE_MASK_HASTITLE	0x00020000
-#define SEE_MASK_FLAG_SEPVDM	0x00040000
+#define SEE_MASK_UNKNOWN_0x1000 0x00001000 /* FIXME: Name */
+#define SEE_MASK_HASLINKNAME    0x00010000
+#define SEE_MASK_FLAG_SEPVDM    0x00020000
+#define SEE_MASK_USE_RESERVED   0x00040000
+#define SEE_MASK_HASTITLE       0x00080000
 /* END NOTE */
 #define SEE_MASK_ASYNCOK	0x00100000
 #define SEE_MASK_HMONITOR	0x00200000
@@ -55,6 +57,7 @@ extern "C" {
 #define SEE_MASK_NOQUERYCLASSSTORE	0x01000000
 #define SEE_MASK_WAITFORINPUTIDLE	0x02000000
 #define SEE_MASK_FLAG_LOG_USAGE	0x04000000
+#define SEE_MASK_FLAG_HINST_IS_SITE 0x08000000
 
 #define ABM_NEW	0
 #define ABM_REMOVE	1

sdk/include/reactos/undocshell.h

@@ -23,7 +23,6 @@
 extern "C" {
 #endif /* defined(__cplusplus) */
 
-
 #if (NTDDI_VERSION < NTDDI_LONGHORN)
 #define DBIMF_NOGRIPPER         0x0800
 #define DBIMF_ALWAYSGRIPPER     0x1000
@@ -615,6 +614,60 @@ HRESULT WINAPI ShellExecCmdLine(
     LPVOID pUnused,
     DWORD dwSeclFlags);
 
+HINSTANCE WINAPI
+RealShellExecuteA(
+    _In_opt_ HWND hwnd,
+    _In_opt_ LPCSTR lpOperation,
+    _In_opt_ LPCSTR lpFile,
+    _In_opt_ LPCSTR lpParameters,
+    _In_opt_ LPCSTR lpDirectory,
+    _In_opt_ LPSTR lpReturn,
+    _In_opt_ LPCSTR lpTitle,
+    _In_opt_ LPVOID lpReserved,
+    _In_ INT nCmdShow,
+    _Out_opt_ PHANDLE lphProcess);
+
+HINSTANCE WINAPI
+RealShellExecuteW(
+    _In_opt_ HWND hwnd,
+    _In_opt_ LPCWSTR lpOperation,
+    _In_opt_ LPCWSTR lpFile,
+    _In_opt_ LPCWSTR lpParameters,
+    _In_opt_ LPCWSTR lpDirectory,
+    _In_opt_ LPWSTR lpReturn,
+    _In_opt_ LPCWSTR lpTitle,
+    _In_opt_ LPVOID lpReserved,
+    _In_ INT nCmdShow,
+    _Out_opt_ PHANDLE lphProcess);
+
+HINSTANCE WINAPI
+RealShellExecuteExA(
+    _In_opt_ HWND hwnd,
+    _In_opt_ LPCSTR lpOperation,
+    _In_opt_ LPCSTR lpFile,
+    _In_opt_ LPCSTR lpParameters,
+    _In_opt_ LPCSTR lpDirectory,
+    _In_opt_ LPSTR lpReturn,
+    _In_opt_ LPCSTR lpTitle,
+    _In_opt_ LPVOID lpReserved,
+    _In_ INT nCmdShow,
+    _Out_opt_ PHANDLE lphProcess,
+    _In_ DWORD dwFlags);
+
+HINSTANCE WINAPI
+RealShellExecuteExW(
+    _In_opt_ HWND hwnd,
+    _In_opt_ LPCWSTR lpOperation,
+    _In_opt_ LPCWSTR lpFile,
+    _In_opt_ LPCWSTR lpParameters,
+    _In_opt_ LPCWSTR lpDirectory,
+    _In_opt_ LPWSTR lpReturn,
+    _In_opt_ LPCWSTR lpTitle,
+    _In_opt_ LPVOID lpReserved,
+    _In_ INT nCmdShow,
+    _Out_opt_ PHANDLE lphProcess,
+    _In_ DWORD dwFlags);
+
 /* RegisterShellHook types */
 #define RSH_DEREGISTER        0
 #define RSH_REGISTER          1
@@ -800,7 +853,7 @@ DWORD WINAPI WinList_Init(void);
 
 IStream* WINAPI SHGetViewStream(LPCITEMIDLIST, DWORD, LPCTSTR, LPCTSTR, LPCTSTR);
 
-EXTERN_C HRESULT WINAPI SHCreateSessionKey(REGSAM samDesired, PHKEY phKey);
+HRESULT WINAPI SHCreateSessionKey(REGSAM samDesired, PHKEY phKey);
 
 LONG WINAPI SHRegQueryValueExA(
     HKEY hkey,
@@ -822,7 +875,6 @@ LONG WINAPI SHRegQueryValueExW(
     #define SHRegQueryValueEx SHRegQueryValueExA
 #endif
 
-EXTERN_C
 HRESULT WINAPI
 CopyStreamUI(
     _In_ IStream *pSrc,