lua: upgrade to 5.2.

Merges Lua52 into the Master branch as the new ‘Lua’ whilst
transitioning the old Lua formula to ‘Lua51’, running the two
side-by-side in a non-conflicting way.
gnuplot: update 4.6.5_1 bottle.
imapfilter: update 2.5.6_2 bottle.
libquvi: update 0.4.1_1 bottle.
lighttpd: update 1.4.35_1 bottle.
lua51: update 5.1.5 bottle.
monotone: update 1.1_1 bottle.
pdnsrec: update 3.6.1_1 bottle.
tracebox: update 0.2_1 bottle.
uwsgi: update 2.0.6_1 bottle.
weechat: update 1.0_1 bottle.
wireshark: update 1.12.0_1 bottle.

Closes #32313.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Updated Sphinx to 2.2.4
Removed libstemmer fix as its now is correct
sphinx: update 2.2.4 bottle.