Work on native ADC

[sjmneves]

Description

• Correct GetDeviceSelector
• Amend comment on NativeGetMaxValue
• Update assembly declarations for STM32 Windows.Devices.Adc (requires
  ADC assembly v1.0.0-preview158 or newer)
• Update assembly declaration for ESP32 ADC functions (requires ADC
  assembly v1.0.0-preview158 or newer)
• Add ADC configuration for ST_STM32F4_DISCOVERY
• Add ADC configuration file to ST_STM32F4_DISCOVERY CMake target
• Update target build configuration for ST_STM32F4_DISCOVERY to include
  ADC

Motivation and Context

• Update native declarations for Windows.Devices.Adc
• Implements Windows.Devices.Adc for STM32 targets

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Signed-off-by: sjmnevessergio.neves@eclo.solutions

[nfbot]

Hi @sjmneves,

I'm nanoFramework bot.
Thank you for your contribution!

A human will be reviewing it shortly. 😉

[CLAassistant]

All committers have signed the CLA.

[josesimoes]

@AdrianSoundy this includes minor changes in ESP32 code. Could you please review them?