[IDEA] Sort Icons

[kookma]

Tiddlywiki 5.1.23+ has strong features for sorting! But the in the core image collections there is no sort icons.

I would suggest add ascending/descending sort icons.

TW Icons 1.0 has some good examples

[Telumire]

Currently the dropdown icon is used in the advanced search but it's true that a sorting icon would be more explicit, I'll try making one

[twMat]

Ref #3388 , I think this should be part of an official plugin among other utility icons.