Add on_toggle method instead of enable/disable in ToolToggleBase#18332

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Ptrskay3 wants to merge 2 commits intomatplotlib:mainfrom

Ptrskay3:tooltogglebase-api-change

Commits on Aug 23, 2020

Add on_toggle instead of enable/disable
Ptrskay3
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Commits on Aug 25, 2020

Merge branch 'master' of git://github.com/matplotlib/matplotlib into tooltogglebase-api-change
Ptrskay3
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