Improve tablet tool button handling.

This change allows the tablet tool button to be used for floating mod
resize. In addition, it attempts to ensure that tablet tool events are
consistent such that tablet v2 events and pointer events will never be
interleaved, and such that the tool buttons count will never fall out of
sync and cause tool button emulation to break.

Some of this logic is similar to what is done for tablet tool tip, but
not quite identical, because of the complication that we have to deal
with multiple inputs that can overlap eachother.

Fixes #7036.

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