675807e2b6
This commit makes grid theming more consistent and capable by adding some new theme colors related to grid rendering. - Add grid theme color for node editor. `UI_view2d_multi_grid_draw` is called with TH_GRID instead of a shaded `TH_BACK`. Also color-blend `TH_NODE_GROUP`. - Make the movie clip editor's clip preview grid respect grid theme color (`ED_region_grid_draw` uses color-blended `TH_GRID`). - Add versioning code to allow fixing existing themes (the resulting themes should visually look the same as before) These changes did cause some inconsistencies in the movie clip editor, even after adjusting the themes accordingly: 1. The alpha slider of the grid color affects the background and not the grid lines themselves. 2. The grids used by graph and dopesheet mode could already be themed in the past. Now that the clip preview's grid can also be themed, two different modes share the same theme color. Differential Revision: https://developer.blender.org/D8699
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