Until now the pre-allocated array size was defined to be 64 without
a way of adjusting it from the calling side.
This commit adds the size as a template parameter.
Using `misc/scripts/fix_headers.py` on all Godot files.
Some missing header guards were added, and the header inclusion order
was fixed in the Bullet module.
karroffel
Rémi Verschelde
Juan Linietsky
Evgeny Zuev