Replace hardcoded use of /tmp directory

[krisgesling]

Description

This adds a new method get_temp_path() that should be used anytime a temporary file or directory is needed. This replaces all uses of the hard coded /tmp directory, in favor of the cross-system tempfile.gettempdir()

The new method does not create any directories or files as it has no concept of whether the requested path contains a file or not.

Fixes #2727
Replaces #2740

All credit to @dzekem who identified the issue and did the bulk of the work on this.

How to test

Unit tests included.
This also touches many parts of the code base.

Contributor license agreement signed?

• CLA - including @dzekem

[pep8speaks]

Hello @krisgesling! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-05-07 06:04:55 UTC

[devops-mycroft]

Voight Kampff Integration Test Succeeded (Results)

[devops-mycroft]

Voight Kampff Integration Test Succeeded (Results)

[forslund]

Added a single nit-picky comment, generally it looks good. Looking forward to getting this into core!

[devops-mycroft]

Voight Kampff Integration Test Failed (Results).
Mycroft logs are also available: skills.log, audio.log, voice.log, bus.log, enclosure.log

[devops-mycroft]

Voight Kampff Integration Test Failed (Results).
Mycroft logs are also available: skills.log, audio.log, voice.log, bus.log, enclosure.log

[devops-mycroft]

Voight Kampff Integration Test Failed (Results).
Mycroft logs are also available: skills.log, audio.log, voice.log, bus.log, enclosure.log

[forslund]

Looks super nice now!

[devops-mycroft]

Voight Kampff Integration Test Failed (Results).
Mycroft logs are also available: skills.log, audio.log, voice.log, bus.log, enclosure.log