bnc#584721: Right text inside the title area on master page

With setting bClearText to true the default text used inside
LO will be removed.
Before that change the imported text was appended to the end of
the LO default text.
Now it contains only the imported text.

Change-Id: I9f5eb0e20468a35c64130a433367cd3845ac7e3c
bnc#584721: Do not add extra title and outliner blocks to master slide

There are master slides / layouts imported from PPTX in which
there is no title or body layout block, but so far Impress
added these by default to the master slides if they were
missing.
Now they are skipped by the importer code.

Change-Id: I256a4e78639ea39d0f87a94e6676422c7dbcde4a
bnc#584721: Import subtitle block to master slides

For some reason subtitle block was skipped for
layouts. It seems we can enable it for layout too,
it appears well on master slides.

Change-Id: I23ec7d4fcce045099bfca9e94a8c9335beaf7468
fdo#81237: 2D OpenGL charts was upside-down

The problem is that LO drawinglayer uses a coordinate system
with an origin at the top-left corner of the screen, while
OpenGL uses a complete coordinate system (with all four
quarters, e.g.: allows negative values). The points in
LO are always positive values which means they are drawn
in the first quarter of the OpenGL coordinate system which
also means that the origin is at the bottom-left corner
of the scene. This difference causes the flipped scene.

* To solve that problem scale the projection matrix with -1.0f
along the y axis.
* glDisable(GL_CULL_FACE) is necessary to avoid dropping primitives
after scaling with -1.0.
* Since projection matrix mirrors also the textures we don't need to
do that inside the ConvertBitmapExToRGBATextureBuffer() method.

Change-Id: Ieba642f3e665778a12368fe50a20865ec8f73514