The card uses non-unique ids for CSS elements inside a card

[ildar170975]

Checklist:

• [ x] I updated to the latest version available
• [ x] I cleared the cache of my browser

Release with the issue:
0.6.3

Last working release (if known):

Browser and Operating System:
Chrome, Win10x64

Description of problem:
The card uses a declutter-child value as an ID for css elements.
Here is an example for custom:mini-graph-card:

As a result - css elements do not have unique IDs in case of presence of several cards on the view.
This becomes a problem when using a card-mod in Safari - using pointers like rect#some_id affects on all similar cards on the view instead of only one particular card.
See a more detailed description: kalkih/mini-graph-card#839

Javascript errors shown in the web inspector (if applicable):
None

Additional information:

[jlsjonas]

decluttering-card actually seems to be overriding the card's id (which is supposed to be unique across the window) here https://github.com/custom-cards/decluttering-card/blob/master/src/decluttering-card.ts#L128
Causing the unintented side-effects down the line