Create global lybrary textures in script

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Rihard
:warning: Old Version Published before Godot 3 was released.

ATTENTION! BAD ENGLISH!

I have sprites for one type wall like that:

enter image description here
enter image description here1024×547 6 KB

Split it by hand - a nightmare. And I want to do it with script.
Question 1: Function “frames” in sprite options.
By default, it ignores borders between sprites. How can I fix that?

Question 2: Global repository for resources.
If I understand this aspect correctly, when I load texture from resourses (load(res://… some.atex)), it is stored in memory in a single copy.
So, can I save objects of new textures like global resource with some function of a game engine, or I need to create Class-container somewhere in main Scene?