efl_canvas_animation_rotate: adjust API
in task T8288 we concluded that a few APIs need to be adjusted in order
to stabelize animation classes at some point. This also adds a new macro
to eina in order to create EINA_VECTOR2 values more easily.
Reviewers: Jaehyun_Cho, segfaultxavi, zmike
Reviewed By: zmike
Maniphest Tasks: T8288
Differential Revision: https://phab.enlightenment.org/D10350