perf(mbyte): single decoder loop for both cluster byte length and cell width

This applies to the callsites which already used utf_ptr2CharInfo
and then utfc_next. There is more work to be done, but this
is a lagom bisectable unit.

A lot of code is still wounded by the historical distinction between
"low" characters (c < 128) and "high" characters, with the UTF-8
specific rules behind compiler flags and virtual function calls. As a
result, there are both ptr2cells() and utf_ptr2cells(). My work aims at
slowly reintegrating the realms. As such, we consider ptr2cells() the
"correct" abstraction as is matches what actually is printed in a
displayed message and buffer text without extra bells and whistles,
except for tabs.

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