added headless mode, numbered keyboard shortcuts, added boot sound (#107) (#113)

[eadmaster]

added:

• headless mode when HAS_SCREEN is not defined port to a generic ESP32-S3 board with no lcd (headless mode) #107
• exposed serial cmds via the webui, added buttons to send ir, rf and badusb scripts
• numbered keyboard shortcuts for the cardputer (port to a generic ESP32-S3 board with no lcd (headless mode) #107 (comment))
• boot sound as alternative to the beeper (copy boot.wav on the root of your SD/LittleFS) port tone function to other boards #113

TIP: since it can only spam all the commands from ir files, you may want to cut a single ir command file like this e.g.:

Filetype: IR signals file
Version: 1
# 
# LG Remote AKB72915206
#
# Captured by: emptythevoid
#
name: Power
type: parsed
protocol: NEC
address: 04 00 00 00
command: 08 00 00 00
#

NOTE: the final # is required!
BONUS: script to convert tasmota irsend jsons to flipper ir files.