Earlier code did not start with squelch totally open, but a tiny bit closed.  (now at app loading, squelch is truly set up with the same value it shows on screen).

I also hardcoded the NFM sampling rate and baseband bandwidth. It seemed "the right thing to do".

You can enable RX and adjust VOLUME  and SQUELCH into your liking.

Sadly enough, you will NOT be able to use VOICE ACTIVATION when RX is enabled (to ensure there will be NO audio feedback defeating the VA sensing)

A "bug" that won over me, but perhaps and hopefully other coder can easily fix:  The Vumeter will momentarily "dissappear" when enabling RX. But it will reappear as soon as you start TX. Or when you turn off RX.

I enabled the PEAK LEVEL MARK on the Vumeter, so you can easily see in which level your input voice / signal is peaking and regulate the MIC gain accordingly in an easier / more robust way.

Side enhancement: Took off the dark green, yellow and red coloring from the vumeter when no signal is present, and replaced it with dark_grey. I know that some coloring is "eye-candy" but the vu-meter is more readable with this new contrast.

fixes file renaming on subdir

The file rename function needs to be called with full_path/old_name  and full_path/new_name.

Instead, it was called with full_path/old_name and new_name ... thus the renamed file ended on the root dir (path not preserved).

Fixes File manager freezing on absent or empty SD

Bigger cursor tick on spectrum waterfall

Added interactive titlebar

I changed width in pixels of the "fine-tune cursor" from 2 to 5 , and then re-centered the cursor, from 120 to 118 to accomodate the shift in width.

I was inspired by this old ISSUE on Havoc's repository, where at the end @furrtek commented the need to make the red tick bigger in the future (but forgot / was swamped with other ehnancements / issues):

https://github.com/furrtek/portapack-havoc/issues/172

Fix MicTX gain when using decimal values

tiny detail

Fix draw bearing

Fixed bug in datetime

As shown in https://github.com/eried/portapack-mayhem/issues/88 ...

Tiny bug but probably responsible for badly forming datetime in several apps, as it is used in ACARS, POCSAG and ADSB_TX (and of course AIS RX)