add ByteWriter to reduce memory copying when writing data

similarly to ByteReader

move both of them down to comphelper, since we want to use it from
comphelper, and comphelper is "below" unotools in the module dependency
graph

Change-Id: Ic98fa2268e125fd8e4378fb899ad5f97de721713
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134645
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

0 files changed, 0 insertions, 0 deletions