Symbols: Reworked the symbol manager so that symbols don't need to be…

… successfully downloaded in succession

- This should fix start menu not working (at all!) on users who upgraded into 22621.2428 not through 22621.2361 with EP installed. Updating into this version will redownload symbols due to changes in the way they are managed.
- 22621.2428 was just released to the general public, but symbols for twinui.pcshell.dll are not available at the time of writing. Despite that, StartDocked.dll and StartUI.dll are still the same as 22621.2361.
- I've also removed hardcoded and stuffed-together offsets of really old DLL versions to make the code more concise.

ExplorerPatcher/StartMenu.c

@@ -765,7 +765,7 @@ BOOL NeedsRo_PositionStartMenuForMonitor(
     return TRUE;
 }
 
-DWORD GetStartMenuPosition(FARPROC SHRegGetValueFromHKCUHKLMFunc)
+DWORD GetStartMenuPosition(t_SHRegGetValueFromHKCUHKLM SHRegGetValueFromHKCUHKLMFunc)
 {
     DWORD dwSize = sizeof(DWORD);
 
@@ -776,7 +776,7 @@ DWORD GetStartMenuPosition(FARPROC SHRegGetValueFromHKCUHKLMFunc)
         SRRF_RT_REG_DWORD,
         NULL,
         &dwTaskbarAl,
-        (LPDWORD)(&dwSize)
+        &dwSize
     ) != ERROR_SUCCESS)
     {
         dwTaskbarAl = 1;