win32: add actype/isactype instead of match_class

TL;DR:
- Add actype/isactype, like POSIX wctype/iswctype, but single-byte.
- actype is a renamed match_class, isactype is yet unused.
- This can be used in win32/{fnmatch,regcomp}.c, and elsewhere - tr.c.

Details:

win32/fnmatch.c and win32/regcomp.c used match_class to get char-class
index for char-class name, which is then used in a switch statement to
choose the single-byte isupper, isalpha, etc.

This is analogous to the POSIX wctype/iswctype, except that wctype
returns 0 for unknown name but match_class returned -1.

This commit renames match_class to actype:
- Returns 0 for unknown name, which at the enum is a new CCLASS_NONE.
- Return type is actype_t (still enum), analogous to wctype_t.
- Rename match_class* to actype* at fname/kbuild/includes/usage.

Both fnmatch.c and regcomp.c don't care whether unknown name in
match_class/actype is -1 (match_class) or 0 (actype). All they care
about is the values at each "case".

Also implemented, but not yet used:
- isactype(c, t):      test whether char c is of type t.
- isactype_not0(c, t): when t is not-0 - same as isactype but faster.
- actail(s, int*):     test for "NAME:]..." without temporary buffer.

Note that this commit focuses on exposing a useful API rather than
performance. Future commits may improve actype/isactype performance.

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