Level meter (#827)

* added possibility to scale vertically from bottom to top

* Squeleton of Level app from Recon App

* Working LevelApp

* Tweaking peak and display or RSSI chart

* Moved widgets, prepared audio decode, added working ctcss display and peak hold max rssi val

* Added RSSIGraph

* Updated Level to use RSSIGraph

* Graph as lines instead as bars

* correct CTCSS hiding if not in NFM mode

* added back db value and drawing for it. clamped to [-100,20] db

* added back audio, volume, better placement for buttons, db graph

* Using different icon for Level app, unless someone provide a better one

* fixed CTCSS position

---------

Co-authored-by: GullCode <gullradriel@hotmail.com>

firmware/application/CMakeLists.txt

@@ -274,6 +274,7 @@ set(CPPSRC
 	apps/soundboard_app.cpp
 	apps/ui_recon.cpp  
 	apps/ui_recon_settings.cpp
+	apps/ui_level.cpp  
 	apps/tpms_app.cpp
 	apps/tpms_app.cpp
 	protocols/aprs.cpp