Control type of search keyword

[vuon9]

Hi, I suggest having these kinds of search keywords to make it easier and controllable.

/s:btc -> search by symbol only
/n:bitcoin -> search by name only
/bitcoin -> default behavior (by symbol, then by name)

Here is a draft PR:
#254

[lyricnz]

As mentioned in the PR:

The search behaviour changed recently - now it searches from where the cursor currently is, so you can do repeated search (by hitting / [enter]).

Yes, there is kindof an edge case where if you search for something slightly obscure (say "coin") it first goes to name/symbol=coin, then each repeat starts from that point (with a substring/partial search). It doesn't seem to be possible to do an approximate search before the full-patch result.