Move common image building code to HaikuImageCommon
Move common image building code to HaikuImageCommon
Beginnings of support for building a bootstrap Haiku image

Copy:
* packages: Haiku -> HaikuBootstrap
* images: HaikuImage -> HaikuImageBootstrap
... and remove some unncessary content.

Setting the jam variable HAIKU_BOOTSTRAP_BUILD enables using the
bootstrap files.
ReleaseBuildProfiles -> Default*, add bootstrap profiles
Move package info pre-processing to jam build system

Also, pre-process all package infos (not only the generic ones) and
define the macro HAIKU_BOOTSTRAP_BUILD, if building a package for a
bootstrap image.
haiku package info: drop some requires in bootstrap mode