Script fixes
* include/grub/script_sh.h (grub_script_cmdline): remove cmdline
(grub_lexer_param): add tokenonhold
(grub_script_create_cmdline): remove cmdline. All callers updated
(grub_script_function_create): make functionname
grub_script_arg. All callers updated
(grub_script_execute_argument_to_string): new prototype
* kern/parser.c (state_transitions): reorder
(grub_parser_cmdline_state): fix a bug and make more compact
* script/sh/execute.c (grub_script_execute_argument_to_string):
make global
(grub_script_execute_cmdline): use new format
* script/sh/function.c (grub_script_function_create): make functionname
grub_script_arg. All callers updated
* script/sh/lexer.c (grub_script_lexer_init): initilaize tokenonhold
(grub_script_yylex): remove
(grub_script_yylex2): renamed to ...
(grub_script_yylex): ...renamed
parse the expressions like a${b}c
* script/sh/parser.y (GRUB_PARSER_TOKEN_ARG): new typed terminal
(GRUB_PARSER_TOKEN_VAR): remove
(GRUB_PARSER_TOKEN_NAME): likewise
("if"): declare as typeless
("while"): likewise
("function"): likewise
("else"): likewise
("then"): likewise
("fi"): likewise
(text): remove
(argument): likewise
(script): accept empty scripts and make exit on error
(arguments): use GRUB_PARSER_TOKEN_ARG
(function): likewise
(command): move error handling to script
(menuentry): move grub_script_lexer_ref before
* script/sh/script.c (grub_script_create_cmdline): remove cmdline
argument. All callers updated
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