Let's try again with the card constructors.

Card::open_modesetting_card() is removed.

The main constructor is Card(const std::string& dev_path = "").

If dev_path is set, the device node with that path is used. If dev_path
is not set, the behavior is similar as previously, except a modeset
capable card is used at the third step:

- If KMSXX_DEVICE env variable is set, the card device with that path is
  opened.
- If KMSXX_DRIVER env variable is set, the card with the given driver
  name and index is opened. The format is either "drvname" or
  "drvname:idx".
- If neither env variable is given, the first modeset capable card is
  opened.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

Drop (I)MappedFramebuffer, as it doesn't really provide any value, and
have most of the methods be present in IFramebuffer with default
exception throwing implementation.

This gives us simpler way to use the framebuffers, as almost always we
can just use a pointer to IFramebuffer.

Add TILER rotation support for omapframebuffer.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

Add OmapCard and OmapFramebuffer classes to utilize omap_bos. Only
non-tiled framebuffer is implemented for now.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>