For force generate ID property for event handler.

Completed:
1. Event handler dialog construct
2. JS code exporting.
3. JS Preview.

Vertical ButtonGroup appears as haux-horizontal in Footer

We can define a "morph" function for a zone so that When adding
a child, it can be morphed to another type. With this feature, we
can have a generic widget in the palette which can adapt
to different types of containers when dropped on them.

Looking for parent zone with the same name. If found, extend it
with descendant zone, otherwize add a new zone.

Also set the default value of count bubble to empty, i.e, no count
bubble

Sorting is still OK without this change and it causes bad
appearance of ButtonGroup and ThumbnailSplitList

…selection

Previous algorithm only supports one zone containers or Headers,
and it works hard to determine the position for insertion. The new
algorithm firstly tries to insert to the zone of the nearest
sibling using enhenced insertChildAfter/Before, if fails, uses
addChild to automatically find a zone to insert.

* modify parser function to support minified theme
* refactor uploadTheme function: add a handler to update items
  in project dialog when upload finished

* add a new property allThemes to record all themes
* refactor uploadTheme function

* also clean up some spaces in deflate.js file

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Conflicts:
	src/js/widgets.js

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Conflicts:
	src/js/views/property.js

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