Include charset.h, ccl.h, and fontset.h.

Include charset.h, ccl.h, and fontset.h.
(PER_CHAR_METRIC): New macro.
(dumpglyphs): New argument CMPCHARP.  Handle multibyte characters.
(XTwrite_glyphs, redraw_previous_char, redraw_following_char):
Supply argument CMPCHARP to dumpglyphs.
(dumprectangle): Display whole glyph of wide-column characters.
Supply argument CMPCHARP to dumpglyphs.
(show_mouse_face): Supply argument CMPCHARP to dumpglyphs.
(x_draw_box): Pay attention to wide-column characters.
(x_draw_single_glyph): Supply argument CMPCHARP to dumpglyphs.
(x_new_font): Call fs_load_font for actual font loading work.
(x_new_fontset): New function.
(x_get_font_info, x_list_fonts, x_load_font, x_query_font): New
functions providing API to fontset handler.
(x_term_init): Initialize several new members of struct x_display_info.