Radiosonde-app-Vaisala-rs41-decoding

Now the Sonde App icon is in green: All sondes in the original proposal are working!

Added the Vaisala RS41 data packet decoding.

Changed the default freq from 402.0 to 402.7 Mhz, since it is more popular freq.

Lowered the frequency stepping, so it is easier to fine-tune the exact freq center, if needed.

Sonde's Serial ID is passed into the VIEW MAP, so now the sonde is labelled on the map.

New main menu footer

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).

Update merge

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