Nyall Dawson 02fffdc64b [needs-docs] Move label obstacle settings to "placement" tab
and show detailed settings in a stacked panel widget

Because:

1. The settings belong next to the placement settings, because they
affect label placement directly (and are closely associated with the
label priority setting in this tab)

2. The label settings widget is ridiculously complex and overwhelming
even for experienced QGIS users. By moving detailed settings into
stacked panels we can avoid the initial complexity of the label settings
whilst also allowing us more flexibility to expose additional settings
in future without adding to the mess. So in future, I propose we move
all detailed settings to sub panels, and leave only the initial "enable"
setting at the top level (e.g. [x] "Repeat levels" -> click settings -> see
all repeat settings).
2019-12-04 14:47:36 +10:00
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