Clean up and simplify image-type setup
This also fixes an unlikely hang involving a circular image description. * src/dispextern.h (struct image.type): Now pointer-to-const. * src/image.c (struct image_type.init) [!WINDOWSNT]: Omit. (IMAGE_TYPE_INIT): New macro. (image_types): Now a small array-of-const, not a pointer. (CACHE_IMAGE_TYPE): Remove; the code’s simpler without it. (ADD_IMAGE_TYPE): Remove this macro, replacing with ... (add_image_type): ... this equivalent function. All uses changed. (define_image_type): Remove. All uses removed. (valid_image_p): Use FOR_EACH_TAIL_SAFE to avoid Emacs hanging if the user creates a circular description of an image. (xbm_type, xpm_type, pbm_type, png_type, jpeg_type, tiff_type) (gif_type, imagemagick_type, svg_type, gs_type): Remove; now done by image_types. (init_imagemagick_functions): Remove decl of nonexistent function. (gs_clear_image): Remove; all uses replaced by image_clear_image. (initialize_image_type): New function, which captures a lot of the previously-scattered WINDOWSNT ifdefs. (lookup_image_type): Use it. (reset_image_types): Remove. All uses removed. (syms_of_image): Don’t worry about ignoring image_types for pdumper, since it’s a constant now.
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