Convert React components to functions

[emanuelen5]

How to: https://react.dev/reference/react/Component#alternatives

To find old style components:

$ git grep -n 'extends React' | grep -v '.tsx' | cut -d: -f1,2 | sort

Todo:

• admin/src/app.jsx:165
• admin/src/Components/CategoryPeriodsInput.js:6
• admin/src/Components/CheckboxInput.jsx:4
• admin/src/Components/CollectionTable.js:5
• admin/src/Components/CountryDropdown.jsx:1044
• admin/src/Components/DatePeriodInput.js:5
• admin/src/Components/DateTimeInput.jsx:5
• admin/src/Components/FileInput.jsx:5
• admin/src/Components/GroupForm.js:7
• admin/src/Components/KeyHandoutForm.jsx:87
• admin/src/Components/Login.jsx:6
• admin/src/Components/Logout.jsx:5
• admin/src/Components/MemberForm.js:7
• admin/src/Components/MessageForm.jsx:33
• admin/src/Components/ProductForm.jsx:52
• admin/src/Components/RequestPasswordReset.jsx:7
• admin/src/Components/SearchBox.jsx:3
• admin/src/Components/SelectInput.jsx:6
• admin/src/Components/Textarea.jsx:4
• admin/src/Components/TextInput.jsx:5
• admin/src/Membership/GroupAdd.js:7
• admin/src/Membership/GroupBoxEditInfo.jsx:8
• admin/src/Membership/GroupBox.jsx:7
• admin/src/Membership/GroupBoxMembers.jsx:38
• admin/src/Membership/GroupBoxPermissions.jsx:26
• admin/src/Membership/KeyEdit.jsx:9
• admin/src/Membership/KeyHandout.jsx:7
• admin/src/Membership/MemberAdd.js:7
• admin/src/Membership/MemberBoxGroups.js:29
• admin/src/Membership/MemberBox.jsx:7
• admin/src/Membership/MemberBoxKeys.js:40
• admin/src/Membership/MemberBoxMemberData.jsx:8
• admin/src/Membership/MemberBoxNewMessage.js:8
• admin/src/Membership/MemberBoxOrders.js:24
• admin/src/Membership/MemberBoxPermissions.js:12
• admin/src/Membership/MemberBoxSpans.jsx:14
• admin/src/Membership/MemberExport.jsx:4
• admin/src/Membership/MembershipPeriodsInput.js:8
• admin/src/Membership/SpanShow.jsx:5
• admin/src/Messages/MessageAdd.js:7
• admin/src/Messages/MessageShow.js:6
• admin/src/Models/CollectionNavigation.js:3
• admin/src/Sales/AccountingBox.jsx:5
• admin/src/Sales/GiftCardShow.js:9
• admin/src/Sales/OrderShow.js:11
• admin/src/Sales/ProductAdd.js:7
• admin/src/Sales/ProductEdit.jsx:8
• admin/src/Settings/AccessTokenList.jsx:8
• admin/src/Settings/ServiceTokenList.jsx:30