Hey there again! 
I would like to orient my uv island horizontally or vertically with one keypress 
Is there any way to do this in blender with one click?
The video is just a demonstration, so
-rectify
-angle based uving
and other ācheatsā working only with rectangles are not allowed 
Thank You for your help in advance
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gorion103
(Zuorion)
2
Align World

or
Align Edge

From BLender TexTools addon
https://github.com/SavMartin/TexTools-Blender/releases/download/v1.5/TexTools_1_5.zip
or similar function from paid addons like

or
UV Toolkit 2.0
or
some else addon cuz why would You not implement same functionality in multiple addons ĀÆ\_(ć)_/ĀÆ
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Thank You for the fast reply!