Update

* Update ui_about.hpp

* Small alignment fix

Old confusing firmware

Merge branch 'master' into gps-sim

Gps sim

Shao credits

Update from origin

* Analog TV app (PAL)

* Icon on main menu

* Analog TV should be yellow

Works for PAL only know, it would be nice to add NTSC in the future, or some customizable sync

* BLE app

* Update ui_navigation.cpp

Co-authored-by: Furrtek <furrtek@gmail.com>

* NRF demodulation

* Update ui_navigation.cpp

dockerfile for compiling a local folder that contains the sourcecode, instead of pulling a fresh copy every time.

To prepare to compile Havoc in Windows/Linux/Mac Docker for example, in the path of the sourcecode:
    docker build -t portapack -f dockerfile-nogit .

And then:
    docker run -v ${PWD}:/havoc portapack

The bin file will be on the build directory now.

Few improvements in ui_transmitter (#332)

Few improvements in ui_transmitter (#332)

* ui_transmitter : Added rf_amp field
* ui_transmitter : Added color grading depending on gain settings
* Removed TransmitterModel::set_rf_amp(bool) call from every apps loading ui_transmit
* transmitter_model : RF_amp disabled by default
* APRS Tx app : Fixed frequency keypad not showing up
* Morse Tx app : Removed TransmitterModel::set_lna() and TransmitterModel::set_vga() calls

https://en.wikipedia.org/wiki/Family_Radio_Service#List_of_FRS_channels_compared_to_GMRS

I experimented with my sensors from a Ford Kuga. For data verification I used the Autel MaxiTPMS TS508 device.

**Summary of changes:**

 - Added *some* inline documentation to make things a little more understandable
 - Replaced ARM toolchain dependency fetching, see #274 
 - Environment variable included to specify new or custom ARM toolchain. As ARM releases new versions of the toolchain, this URL can be changed.

Changed some wordings.