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This wasn't working reliably (after clear for example), and wasn't used anywhere.
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alloc_size was set incorrectly causing arrays not to be resized correctly.
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Part of patch D1670 by @LazyDodo
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Useful for re-using a buffer when the existing data can be thrown away.
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Also move comment to C-source and enumerate useful features.
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When resizing, zero memory when the calloc flag is set,
even when no realloc is done.
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- assert if BLI_buffer_at() is called with an out of bounds value.
- add BLI_buffer_resize_data() macro which resizes and returns a pointer to the new array.
- warn if missing call to BLI_buffer_free().
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- add option to calloc or not, existing code wasnt consistent here, would calloc on first alloc but not on realloc, also - the static memory was never zero'd.
use flag BLI_BUFFER_USE_CALLOC to ensure all new memory is zero'd (static/alloc/realloc's).
- add BLI_buffer_declare_static / BLI_buffer_declare so its possible to have a buffer that never uses static memory.
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BLI_buffer is a dynamic homogeneous array similar to BLI_array, but it
allocates a structure that can be passed around making it possible to
resize the array outside the function it was declared in.
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