David Capello 14ba0ab411 Add addition/subtract/divide blending modes
Changes:
* Added SeparatorInView() to add separators inside a ListBox or ComboBox.
* Added BlendModeItem() to represent each item in the blending modes
  ComboBox.
* Now a ComboBox can contain any kind of widgets as children (not just
  ListItem). This is required to add separators in the blending modes
  ComboBox.

Feature request:
https://community.aseprite.org/t/additive-blending-feature/121
2017-07-24 15:25:13 -03:00
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