core: Use single definition rule for cell-type.
* src/mes.c (scm_type_char, scm_type_closure, scm_type_continuation,
scm_type_function, scm_type_keyword, scm_type_macro,
scm_type_number, scm_type_pair, scm_type_ref, scm_type_special,
scm_type_string, scm_type_symbol, scm_type_values,
scm_type_variable, scm_type_vector): New symbol.
(mes_symbols): Add them.
* module/mes/type-0.mes (<cell:char>, <cell:char>, <cell:closure>,
<cell:continuation>, <cell:function>, <cell:keyword>, <cell:macro>,
<cell:number>, <cell:pair>, <cell:ref>, <cell:special>,
<cell:string>, <cell:symbol>, <cell:values>, <cell:variable>,
<cell:vector>, <cell:broken-heart): Remove.
* module/mes/boot-0.scm: Likewise.
* module/mes/boot-01.scm: Likewise.
* module/mes/boot-02.scm: Likewise.
* scaffold/boot/20-define-quote.scm: Likewise.
* scaffold/boot/37-closure-lambda.scm: Likewise.
* scaffold/boot/38-simple-format.scm: Likewise.
* scaffold/boot/4c-quasiquote.scm:
* scaffold/boot/4e-string-split.scm: Likewise.
* scaffold/boot/51-module.scm: Likewise.
* scaffold/boot/52-define-module.scm: Likewise.
* scaffold/boot/60-let-syntax.scm: Likewise.
* module/mes/guile.scm: Add some of them.