This had the unfortunate implementation detail that depended on the
strings having 1 byte == 1 column hold true. As we know, this is not at
all the case once you move past the base ASCII character set.

Reimplement this whole thing so it doesn't depend on format strings at
all. Instead, simply calculate the max column widths, and then when
displaying each row add the correct amount of padding using UTF-8 safe
string length functions.

Before:

名字        旧版本新版本  净变化 下载大小

libgee                0.6.2.1-1  0.60 MiB    0.10 MiB
libsocialweb          0.25.19-2  1.92 MiB    0.23 MiB
folks                 0.6.3.2-1  1.38 MiB    0.25 MiB

After:

名字          旧版本  新版本     净变化    下载大小

libgee                0.6.2.1-1  0.60 MiB  0.10 MiB
libsocialweb          0.25.19-2  1.92 MiB  0.23 MiB
folks                 0.6.3.2-1  1.38 MiB  0.25 MiB

Signed-off-by: Dan McGee <dan@archlinux.org>