[oe] RFC: Sane default for SPLASH

[Rolf Leggewie]

Hello,

the variable SPLASH is currently defined and not defined in a variety of
places leading to undesired results.  I think it should be set OE-wide
to a sane default.  Sane for me would be either "" to not have a splash
at all or psplash or some other generic splash that shows an OE logo.
As always, this would be set ?= so that distributions and individuals
can override the setting.  I think the sane default is no splash but
invite your opinion on the matter.

Regards

Rolf