d204830107
No user-visible changes expected. Essentially, this makes it possible to use C++ types like `std::function` inside `uiBut`. This has plenty of benefits, for example this should help significantly reducing unsafe `void *` use (since a `std::function` can hold arbitrary data while preserving types). ---- I wanted to use a non-trivially-constructible C++ type (`std::function`) inside `uiBut`. But this would mean we can't use `MEM_cnew()` like allocation anymore. Rather than writing worse code, allow non-trivial construction for `uiBut`. Member-initializing all members is annoying since there are so many, but rather safe than sorry. As we use more C++ types (e.g. convert callbacks to use `std::function`), this should become less since they initialize properly on default construction. Also use proper C++ inheritance for `uiBut` subtypes, the old way to allocate based on size isn't working anymore. Differential Revision: https://developer.blender.org/D17164 Reviewed by: Hans Goudey
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