Make "noBorder" possible for Screenshots

[xstable]

At the Moment if you take a screenshot (rectangle area of the screen) it has an green border around.
Would be nice, if we could toggle this like needed.

Because sometimes I make a screenshot, pin it... move it to another point at the screen, take another screenshot (with the pinned one inside) and so on.
In this case, the Green Borders are a huge downside.

Se this image for an example... I've sliced 3 lines in an phpmyadmin web-browser window and concat them:

[AlexP11223]

Yeah, I had the same desire yesterday, so I submitted PR.

[lr222gw]

Would be nice to be able to set this through GUI,
meanwhile this can be achived by modifying the .cfg file; .config/Dharkael/flameshot.ini

[General]
buttons=@Variant(\0\0\0\x7f\0\0\0\vQList<int>\0\0\0\0\x12\0\0\0\0\0\0\0\x1\0\0\0\x2\0\0\0\x4\0\0\0\x5\0\0\0\x6\0\0\0\x12\0\0\0\xf\0\0\0\a\0\0\0\b\0\0\0\t\0\0\0\x10\0\0\0\n\0\0\0\v\0\0\0\f\>
contastUiColor=#008080
contrastOpacity=204
disabledTrayIcon=false
drawColor=#000000
drawThickness=0  
showHelp=true  
uiColor=#006e6e6e

Change uiColor from;
#6e6e6e <-- Some six digit hexvalue
To
#006e6e6e <-- Eight digit hexvalue; the first digits should be 00, this will set the opacity to 0%...

[xstable]

Awesome Applikation.
Hope @lupoDharkael will find some time to merge some of the PR's.
I think it will boost the Applikation a lot. There is still no better Screenshot-App for linux out there.