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So we can display ¯\_(ツ)_/¯ in ASCII. It's really important.

Eliminate duplicate case statements added in previous commit (some of these were already mapped using numeric constants).

Added more "black square" -> CP437 0xFE mappings.
Added Unicode FULL/HALF block -> CP437 mappings.

translating from Unicode to CP437.
Use the UNICODE_HOUSE macro instead of the codepoint hex-value.

for some obvious (but missing) mappings.

Fix error in CP437 0x96 (small U with circumflex) translation to UNICODE
(typo: 0x00FB not 0x00F8).

Expression syntax in function unicode_to_cp437
:-(

unicode_width() now correctly returns 2 for the CJK and other code points that
are typically displayed in 2 columns with non-proportional fonts.

with UNICODE_*

enumeration value '...' not handled in switch

in unicode_width().

Replaced unicode_is_zerowidth() with unicode_width(), in preparation for
"fullwidth" char support.
Added UNICODE_UNDEFINED definition (0x0000)
(UNICODE_NULL is already defined, at least in MSVC).

enum unicode_codepoint.
I got tired of looking up and cross-referencing all these damn numbers.

is defined (not defined by default).

New function (derived from sbbs_t::utf8_to_cp437()): unicode_to_cp437()
New utf8 functions: utf8_replace_chars(), utf8_str_is_valid().
utf8_getc() enhancement: val arg may be NULL (for length/validation uses).