Fix Layout Editor Rendering of Bricks

In a recent commit to master I forgot to add the layout_height attribute
in one of the styles, disabling the rendering of brick layouts in the
Eclipse Layout Editor. This commit corrects this error.
(cherry picked from commit 283146494cd0e16eb964d521911bc59aa3c7d676)
Refactored loop-bricks
Refactored note-brick
Refactored broadcast-bricks. Mainly removed unnecessary LinearLayout