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.

FlipperZero-WiFi-Scanner_Module/FlipperZero-WiFi-Scanner_Module/FlipperZero-WiFi-Scanner_Module.ino

Line 470 in ac9b599

int incommingCommand = Serial.read();