Added option to customize Pinned folder location

Items can be pinned to directories that require administative privileges
(such as Open-Shell's default installation directory), so long as users
take ownership of the pinned folder. Also adds a command to Open-Shell's
context menu that opens the current pinned folder.

Adds general support for directory-based settings by creating a new
setting type called TYPE_DIRECTORY which uses a new bool added to
BrowseLinkHelper, called bFoldersOnly. START_MENU_PINNED_ROOT
has been removed, and all instances of both it and BrowseLinkHelper
have been adjusted accordingly. To create your own directory-based
settings, use CSetting::TYPE_DIRECTORY. Empty directory paths are
reset to their default value as they can cause unexpected behavior.

Src/StartMenu/StartMenuHelper/StartMenuExt.cpp

@@ -91,7 +91,7 @@ STDMETHODIMP CStartMenuExt::Initialize( PCIDLIST_ABSOLUTE pidlFolder, IDataObjec
 		bUsePinned=(setting==1);
 	if (bUsePinned)
 	{
-		Strcpy(m_PinFolder1,_countof(m_PinFolder1),L"%APPDATA%\\OpenShell\\Pinned\\");
+		Sprintf(m_PinFolder1,_countof(m_PinFolder1),L"%s\\",GetSettingString(L"PinnedItemsPath"));
 		DoEnvironmentSubst(m_PinFolder1,_countof(m_PinFolder1));
 		m_PinFolder2[0]=0;
 	}

Src/StartMenu/StartMenuHelper/dllmain.cpp

@@ -57,6 +57,7 @@ CSetting g_Settings[]={
 	{L"DisablePinExt",CSetting::TYPE_BOOL,0,0,0},
 	{L"FolderStartMenu",CSetting::TYPE_STRING,0,0,L""},
 	{L"FolderCommonStartMenu",CSetting::TYPE_STRING,0,0,L""},
+	{L"PinnedItemsPath",CSetting::TYPE_DIRECTORY,0,0,L"%APPDATA%\\OpenShell\\Pinned"},
 
 {L"Language",CSetting::TYPE_GROUP},
 	{L"Language",CSetting::TYPE_STRING,0,0,L"",CSetting::FLAG_COLD|CSetting::FLAG_SHARED},