Rework P4Ruby unit tests so they they are actually units. Now the
test order is irrelevant as all tests are standalone. Tidied up
the code formatting as well and removed all the tabs from the ruby
sources files. Added a modeline for vim users so consistent
indentation will be used.
Pull 10.2 changes to main
Pick up missing changes in p10.2 and integrate to main.
As part of the integrate I also moved the unit tests '16_streams.rb' and
'17_streaming_handler.rb' because the integration introduced collisions with
the unit test names. Updated MANIFEST with new names for unit tests and also
added '98_unicode.rb', which was missing from it.