ShellPkg: Move FindFirstCharacter/GetNextParameter to ShellCommandLib

And add Shell prefix to the two library APIs.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

ShellPkg/Application/Shell/ShellParametersProtocol.h

@@ -190,34 +190,5 @@ ParseCommandLineToArgs(
   IN OUT UINTN    *Argc
   );
 
-/**
-  return the next parameter from a command line string;
-
-  This function moves the next parameter from Walker into TempParameter and moves
-  Walker up past that parameter for recursive calling.  When the final parameter
-  is moved *Walker will be set to NULL;
-
-  Temp Parameter must be large enough to hold the parameter before calling this
-  function.
-
-  @param[in, out] Walker          pointer to string of command line.  Adjusted to
-                                  reminaing command line on return
-  @param[in, out] TempParameter   pointer to string of command line item extracted.
-  @param[in]      Length          Length of (*TempParameter) in bytes
-  @param[in]      StripQuotation  if TRUE then strip the quotation marks surrounding
-                                  the parameters.
-
-  @return   EFI_INALID_PARAMETER  A required parameter was NULL or pointed to a NULL or empty string.
-  @return   EFI_NOT_FOUND         A closing " could not be found on the specified string
-**/
-EFI_STATUS
-EFIAPI
-GetNextParameter(
-  IN OUT CHAR16   **Walker,
-  IN OUT CHAR16   **TempParameter,
-  IN CONST UINTN  Length,
-  IN BOOLEAN      StripQuotation
-  );
-
 #endif //_SHELL_PARAMETERS_PROTOCOL_PROVIDER_HEADER_