Preparation for Release 6.1.0

[slaff]

This issue is created to collect all the tasks we need to do before the 6.1 release.

Source Code

• Update Sming/Core/SmingVersion.h.
• Update Readme.md.
• Merge develop into master.
• Tag the source code in the master branch.
• Add upgrade document

New features

• Add Adafruit BMP280 library and sample application #2953
• Add sample to demonstrate basic dual-core operation #2949
• Support dropping named partitions using string values for size #2948

Improvements

• Support dropping named partitions in hardware configs #2934
• Update Rp2040 picotool to 2.1.2 dev (from 2.1.0) #2961
• Update pico-sdk to 2.1.2 dev. #2959
• Fix ConfigDB library build errors/warnings and improve schema validation #2957
• Remove the cstdbool include for newer C++ compilers #2954
• Update ConfigDB to v1.1.0 #2946
• Backported igmp_start_timer  #2937

Bug fixes

• Avoid divide-by-zero in Rational tests #2960
• Fix Rp2040 issue calling wifistation enable after config #2958
• Fix breaking DiskStorage library tests #2939
• Fix FWFS builder handling of UTF8-encoded filenames #2945
• Fix Formatter UTF8 encoding #2944

Changes

Deprecations

Breaking Changes

Security

All PRs scheduled for this release can be seen from here

[slaff]

@mikee47 I am planning to release this version at the end of the month. Make sure to push new PRs before the 20th of July.