hob: Hob custom image build error

For a custom image from scratch, the image version is not set and
it gives an error.

[YOCTO #4065]
Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
hob: implementation of search functionality in Hob

Implemented the search functionality for recipes and packages using
filters on the listmodel. I have used the design which can be found in
bugzilla.

[YOCTO #3529]
Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Adjust spacing on information windows

[Hob #4070]

- tweaked the spacing on info windows

- fixed text bolding in simple settings dialog

Signed-off-by: Andrei Dinu <andrei.adrianx.dinu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>