Scriptengine

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Fixes
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- 86: Installation from package fails

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Fixes
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- 83: Prevent base.getenv from failing when environment variable does not exist
- 84: base.command fails if ignore_error is true

Internal changes
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- Base package build on pyproject.toml (80)
- 82: Use ubuntu-20.04 in Github actions (keep Python3.6 support)
- 64: Require deepdiff 6.2.2

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Fixes
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- Fix base.remove breaks without ignore_not_found 79

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Fixes
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- Fix module not found error for scriptengine.tasks.base.file

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Features
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- 70: Support wildcards and lists in file tasks
- 77: Add base.context.from (thanks mandresm for suggesting)

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Features
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- Add coverage+coverall to CI (72)
- Add badges to README (72)

Fixes
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- Fix 74: base.find correct update context