QtGui standalone and embedded. Minor tree changes in available tree drawing functions (ladderize nodes)#567

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m-nikolaidis wants to merge 3 commits intoetetoolkit:ete3from

m-nikolaidis:master

Commits on Sep 4, 2021

Minor changes to QtGui. Made possible to use ete GUI from other QApplications. Added leaf name color attribute
m-nikolaidis
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Deleted unnecessary file
m-nikolaidis
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Commits on Sep 6, 2021

Added child_app kwarg to make the treeview GUI work both embedded and standalone
m-nikolaidis
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