PR: Add plugin teardown operations to the plugin registry

[andfoy]

Description of Changes

This PR adds plugin teardown capabilities to the already existing plugin registration mechanism. By using the teardown functions, Spyder will be able to disable and enable plugins without restarting.

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #15594

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: @andfoy

Stacked PR Chain: [spy-plugin-registry-teardown]

PR	Title	Merges Into
#16012	[spy-plugin-registry-teardown] PR: Add plugin teardown operations to the plugin registry	N/A
andfoy#1	[spy-plugin-registry-teardown] PR: Migrate application teardown to use the new teardown mechanism	#16012
andfoy#2	[spy-plugin-registry-teardown] PR: Migrate breakpoints to use the new teardown mechanism	andfoy#1
andfoy#3	[spy-plugin-registry-teardown] PR: Migrate completions plugin to use the new teardown mechanism	andfoy#2
andfoy#4	[spy-plugin-registry-teardown] PR: Migrate Console, Explorer and Find in files to use the new teardown mechanism	andfoy#3
andfoy#5	[spy-plugin-registry-teardown] PR: Migrate help to use the new teardown mechanism	andfoy#4
andfoy#6	[spy-plugin-registry-teardown] PR: Migrate history and layouts to use the new teardown mechanism	andfoy#5
andfoy#7	[spy-plugin-registry-teardown] PR: Migrate Outline explorer, plots, preferences and profiler to use the new teardown mechanism	andfoy#6
andfoy#8	[spy-plugin-registry-teardown] PR: Migrate projects to use the new teardown mechanism	andfoy#7
andfoy#9	[spy-plugin-registry-teardown] PR: Migrate pylint, run and shortcuts to use the new teardown mechanism	andfoy#8
andfoy#10	[spy-plugin-registry-teardown] PR: Migrate statusbar, toolbar and tours to use the new teardown mechanism	andfoy#9
andfoy#11	[spy-plugin-registry-teardown] PR: Migrate variable explorer and working directory to use the new teardown mechanism	andfoy#10
andfoy#12	[spy-plugin-registry-teardown] PR: Add preference page to enable and disable plugins	andfoy#11

[pep8speaks]

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

• In the file spyder/api/plugin_registration/_confpage.py:

Line 26:80: E501 line too long (80 > 79 characters)
Line 27:80: E501 line too long (82 > 79 characters)
Line 29:80: E501 line too long (81 > 79 characters)
Line 100:80: E501 line too long (81 > 79 characters)
Line 103:80: E501 line too long (81 > 79 characters)

• In the file spyder/api/plugin_registration/registry.py:

Line 123:80: E501 line too long (94 > 79 characters)
Line 126:80: E501 line too long (94 > 79 characters)
Line 213:33: E127 continuation line over-indented for visual indent

• In the file spyder/app/mainwindow.py:

Line 1466:80: E501 line too long (81 > 79 characters)
Line 1827:14: E128 continuation line under-indented for visual indent

• In the file spyder/plugins/preferences/api.py:

Line 265:80: E501 line too long (83 > 79 characters)

• In the file spyder/plugins/preferences/plugin.py:

Line 110:80: E501 line too long (80 > 79 characters)
Line 112:21: E127 continuation line over-indented for visual indent
Line 310:5: E303 too many blank lines (2)

• In the file spyder/plugins/workingdirectory/plugin.py:

Line 138:80: E501 line too long (80 > 79 characters)

• In the file spyder/utils/icon_manager.py:

Line 337:80: E501 line too long (85 > 79 characters)
Line 338:80: E501 line too long (88 > 79 characters)

Comment last updated at 2021-10-06 22:37:21 UTC

[ccordoba12]

Hey @andfoy, one last, tiny review, then this should be (at last!) ready.

[ccordoba12]

Thanks a lot @andfoy for your hard work and patience with this one. This is a great improvement!