sw btlr writing mode: implement initial layout

The bulk of this commit is reasonably straightforward, the interesting parts
are:

- SwFrame::CheckDir() is where the layout reads the doc model, i.e. sets the
  new SwFrame::mbVertLRBT.

- We had 3 text directions previously: horizontal, vertical (implicitly RL) and
  vertical LR (implicitly TB). This adds a 4th text direction for the LRBT case.

- SwTextFrame::SwitchHorizontalToVertical() is responsible for re-locating the
  origo of a string to be painted from the top left to the bottom left corner (in
  addition to the height/width swap that's done for all vertical directions).

- Finally MapDirection() is the place where we map Writer's new btlr mode (with
  no character rotation) to VCL's 900 (90 degrees) rotated direction.

No functional changes intended for existing text directions. Lots of places are
still not yet adapted, but this is good enough to paint a single word in a
table cell at the correct position with the correct direction.

Change-Id: I465c62db6562d8a2be140c3d37473e590830139e
Reviewed-on: https://gerrit.libreoffice.org/67740
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

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