[composer] More cleanups - move font utils from QgsComposerItem to QgsComposerUtils, add tests
[composer] documentation improvements
[composer] Write a dummy Grid element when saving composer maps, fixes crash when loading project in older QGIS versions (fix #10905)
[composer] Fix restoration of grid color alpha channel from 2.4 projects
[composer] Don't auto set maximum number of attributes when resizing item. Instead, keep the maximum number of rows as whatever the user set. This change prevents the attribute table from shrinking and never re-growing (fix #10911)