Port icons from Power Tools extension

[pharring]

According to a review on the Marketplace, the Power Tools extension had

up-to-date VS2017-style icons (this extension still uses old-school colored ones which look bad on a dark theme).

I believe this is referring to the icons on the context menu commands.
See if we can locate the icons used in Power Tools and port them over.
(May need to seek permission from the current Power Tools owners or find alternatives)

[RayKoopa]

Hey there, thanks for tracking this.

Yeah, I indeed meant the context menu icons with this. This is how they look with a dark theme in the Power Tools version in 2017 and this extension:

I updated my review on the gallery according to your reply. Speaking of the context menu, I also wondered if an entry to change the guideline color (as in the Power Tools version) should be added to make that feature more discoverable.

[pharring]

I located the icons from PPT. Need to check with the current owners if I have permission to use them.

[pharring]

See #50 for bringing back "Guideline Color..."

[pharring]

Got permission to use the icons. I should have time to push out an update this weekend.

[RayKoopa]

Excellent! I'll update my review when it's out.

[pharring]

Release 2.2.4 with the updated icons is in the Marketplace now.