Fix platformIO build directories, move testing to run natively.

[davetcc]

The GitHub actions are failing, this must be fixed for all other libraries too. IoAbstraction, TaskManagerIO, tcUnicodeHelper builds too.

Just task manager has a failing test that needs fixing. All others are OK.

Things needed:

1. PlatformIO builds are failing because the examples have been refactored. Sort out the ini file.
2. Move the tests to run on the native platform, and make a TaskManagerIO and IoAbstraction platform-dep for it. There is already a MockIo and MockEeprom, we can use those. Any on device testing will be moved to part of the board testing process and integrated into a suitable example.