Add blend mode option for features, allows blending to be used between features in a layer
[feature] Layer transparency for vectors (fix #7692)
[feature] blend modes for composer map grids (fix #7777)
[feature] Add font color control for grid annotations (fix #7789)
Tests for grid blending, grid color labels, vector feature blending and vector layer transparency
Add python bindings and tests for grid blending, grid annotation font color, vector feature blending and vector layer transparency
Merge pull request #590 from nyalldawson/advanced_composition

FFE? some blending fixes & composition feature requests