Resizing widgets

[javipacheco]

This PR is the last part in issue #1164 in order to:

• Consider other widgets when the user is resizing
• Quit for resizing mode when the user click out of the widget
• Delete widget when the user drop in the top bar
• Clean previous implementation

@anamariamv could you please review? thanks!

[47degdev]

Current coverage is 31.49% (diff: 9.09%)

Merging #1176 into featured-branch-drag-widgets will decrease coverage by 0.07%

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  Methods                           15066      14919   -147   
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+ Misses                            10580      10483    -97   
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[anamariamv]

LGTM!!