evas_vg_load_svg: get rid of static Evas_SVG_Parsing

Summary:
Refactoring.
It is good to store values from that struct in a parsing/loading context

static variable is a big NO NO:

1. Ugly code design,
2. Might not work when trying to load more than one SVG file.

@fix

Reviewers: jpeg, smohanty

Subscribers: jenkins, cedric

Differential Revision: https://phab.enlightenment.org/D5399