C-style casts should be replaced with appropriate C++ cast operators
for better type safety and code clarity. This change fixes cppcheck
style warnings about C-style pointer casting by using:
- static_cast for simple pointer type conversions
- reinterpret_cast for memory buffer pointer arithmetic

The changes maintain identical functionality while following modern
C++ best practices for explicit casting.

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

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

New pixel format code, from Python pixutils library.

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

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.