ExpandableListItem: port to *Handlers

We already had one TapHandler to handle left clicks and taps; we can use
another one for right-clicks too, and a HoverHandler for hover. This will
let us remove the parent MouseArea item for greater semantic correctness
and performance.
12 jobs for !336 with port-expandablelistitem-to-handlers in 1 minute and 44 seconds (queued for 30 seconds)
detached
Status Name Job ID Coverage
  Build
passed suse_tumbleweed_qt515 #133514
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00:01:44

failed suse_tumbleweed_qt515 #133422
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failed suse_tumbleweed_qt515 #133438
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failed suse_tumbleweed_qt515 #133503
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failed suse_tumbleweed_qt515 #133505
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failed suse_tumbleweed_qt515 #133511
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failed suse_tumbleweed_qt515 #133509
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failed suse_tumbleweed_qt515 #133512
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failed suse_tumbleweed_qt515 #133513
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failed suse_tumbleweed_qt515 #132788
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failed suse_tumbleweed_qt515 #133035
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failed suse_tumbleweed_qt515 #133209
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00:00:35