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Hot-fix release for library detection regression.

See arduino/arduino-cli#1290

• Imported all fixes from arduino-cli 0.18.2

• Removed automatic '--relax' hack for compiles on Atmega2560 MCU https://github.com/arduino/arduino-cli/pull/749

• Fixed skethbook+bootloader hex merger. https://github.com/arduino/arduino-cli/pull/744

• Fixed race condition in legacy i18n.LoggerToCustomStreams https://github.com/arduino/arduino-cli/pull/704

• Fixed path-relativization error when traversing different partitions https://github.com/arduino/arduino-cli/pull/658

• Add macro during lib discovery phase https://github.com/arduino/arduino-cli/pull/633

• legacy: Improved progress report from Compile https://github.com/arduino/arduino-cli/pull/625

Imported fixes from upstream arduino-cli

• Reduce priority for IDE-bundled platform releases https://github.com/arduino/arduino-cli/pull/579
• Fixed wrong escaping on legacy MachineLogger https://github.com/arduino/arduino-cli/pull/577
• Fix library priority selection (again) https://github.com/arduino/arduino-cli/pull/574
• Improve precompiled libraries handling https://github.com/arduino/arduino-cli/pull/512

• Fix library priority selection (https://github.com/arduino/arduino-cli/pull/565)
• Load contents of source files only when needed (https://github.com/arduino/arduino-cli/pull/559)
• Allow naming sketches like "RCS" and "CVS" (https://github.com/arduino/arduino-cli/pull/537)