EXT-7527 FIXED repositioned "Add more..." button (panel edit outfit)

- relocated Add button (required substantial layout_stacks repositioning)
- got rid of switch/shop buttons
- reverted addition of adaptors for (accordion tabs/list view) inline button bars

* failed to get rid of an empty space above bottom bars when "add wearables panel" is invisible
(due to bug in the layout stack, when border is still drawn below layout panel which is only one visible)
https://jira.secondlife.com/secure/attachment/39854/empty+space+.jpg

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/481/

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branch : product-engine