[BOOT:LIB] More initialization and cleanup

Started BlpMmDestroy(), MmMdDestroy(), MmPaDestroy(),
EfiSetWatchdogTimer(), EfiOpenProtocol(), EfiConInExSetState(), and
BlDestroyLibrary().
Completed BlpFwInitialize().
Improved InitializeLibrary().

BOOT/ENVIRON/INC/bootlib.h

@@ -426,11 +426,13 @@ extern BOOT_APPLICATION_ENTRY BlpApplicationEntry;
 
 #if defined(_EFI)
 extern PBOOT_FIRMWARE_DATA EfiFirmwareParameters;
+extern EFI_HANDLE EfiImageHandle;
 extern EFI_SYSTEM_TABLE *EfiST;
 extern EFI_BOOT_SERVICES *EfiBS;
 extern EFI_RUNTIME_SERVICES *EfiRT;
 extern SIMPLE_TEXT_OUTPUT_INTERFACE *EfiConOut;
 extern SIMPLE_INPUT_INTERFACE *EfiConIn;
+extern EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *EfiConInEx;
 #endif
 
 VOID
@@ -469,6 +471,11 @@ BlpFwInitialize (
     IN PBOOT_FIRMWARE_DATA FirmwareData
     );
 
+NTSTATUS
+BlpMmDestroy (
+    IN ULONG Stage
+    );
+
 NTSTATUS
 BlpMmInitializeConstraints (
     VOID