- When returning the number of items in a collection use BLI_*_len()
- Keep _size() for size in bytes.
- Keep _count() for data structures that don't store length
(hint this isn't a simple getter).
See P611 to apply instead of manually resolving conflicts.
Issue was, in case of using such stack within a structure, the '_' underscore
would be added in front of struct variable
(e.g. `my_struct.my_stack` would lead to (try to) using `_my_struct.my_var_pool` ...).
Now underscore is appended to var names, ugly but working.
Note did not touch to the alloca variants of those macros, since in this case enforcing
a pure local use is best I think.
it can be added and removed many times per function but will always remain the size of the maximum number of items.
not used yet, added for normal calculation function from mont29.
