performance tuning of helpex

callgrind (on text/swriter/guide translated in 'fr')

before Ir = 889,687,925
after Ir = 406,372,177 (405,668,292 w/o the 'native' memory allocator)

time confirms:
before 0.288/0.272/0.016
after  0.146/0.131/0.015

the output before and after were diff-ed and every generated xhp files
are identical.

All improvements where done still using 'normal' sal and c++ API.

There are still some low-hanging fruits, like XMLUtil:QuoteHTML
(probably 20-30 millions Ir to shave there)

The destruction of XMLElements is also singularly high
(11% of the remaining Ir count)

But the bulk of what is left is OString management (alloc/acquire/release/
free/copy), and I/O using streams

Change-Id: Ia316c953cd4bd46fc33a58a0c10f26b0ffa042c2
Reviewed-on: https://gerrit.libreoffice.org/1262
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>
Reviewed-by: Andras Timar <atimar@suse.com>
Tested-by: Andras Timar <atimar@suse.com>

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