This reverts commits 54fd8176d7, 4c5becb6b1 and 8f578150e.
Those kind of commits must be reviewed and approved by project owners.
That one:
* Broke Collada building by not properly updating all calls to modified
function.
* Broke *whole* ID management by not properly updating library_query.c.
And in general, I am strongly against backward ID pointers, those are
*always* a serious PITA for ID management. Sometimes they cannot be
avoided, but in general other ways to get that kind of info should be
investigated first.
This is the angular diameter as seen from earth, which is between 0.526° and
0.545° in reality. Sharing the size with other light types did not make much
sense and meant the unit was unclear.
Differential Revision: https://developer.blender.org/D4819
Use the term "AFTER" instead of "OFS" since it wasn't obvious these
macros operate on everything after the struct member passed.
Avoid casting to non-const types when only reading.
