Replace existing commands with more "nice looking"

[SequoiaSan]

I mean that commands that consist from one character aren't nice looking and almost meningless. This was done like that only because full commands like "Next", "Scan" etc. took a lot of time to parse and slowed down program. Need additional investigation.

https://github.com/SequoiaSan/FlipperZero-WiFi-Scanner_Module/blob/ac9b5995f1616c5c493ccb035d8b47fbe9a9817e/FlipperZero-WiFi-Scanner_Module/FlipperZero-WiFi-Scanner_Module.ino#L470