Nyall Dawson 3a1ac1a995 [composer] Attach compositions to QgsProject
This adds a new QgsLayoutManager class which is used for
storage and serializing/deserializing of compositions.

A QgsLayoutManager is attached to QgsProject. This allows
core code to access the compositions attached to a project.
The intention is to move all handling of compositions from
app to core, making it easy for server to access project
compositions without resorting to fragile xml parsing.
2017-03-21 10:32:52 +10:00
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