3.0.0-beta.4

• [BC Break] Remove ra-realtime (3908) (fzaninotto)
• Add <CoreAdminContext> to ease custom apps (3907) (fzaninotto)
• Fix warning in <ResettableTextField>. (3904) (WiXSL)
• Fix <ReferenceArrayInput> does not work in Filters (3898) (fzaninotto)
• Fix <DateTimeInput> style differs from other inputs (3897) (fzaninotto)
• Fix notifications upgrade guide (3893) (WiXSL)
• Fix ResettableTextField adornment style (3891) (tdeo)
• Fix <AutocompleteInput> default width and margin (3890) (tdeo)
• Fix <DeleteWithConfirm> throws exception (3889) (fzaninotto)
• Fix incorrect test data in simple example (3888) (fzaninotto)
• Fix search field loses its value when a column is sorted (3887) (m4theushw)
• Fix deprecated React types (3886) (WiXSL)
• Fix missing await for async operation in test. (3885) (WiXSL)
• Fix bug when using <SimpleForm> with <ArrayInput> (3884) (jinseoplee)
• Fix typo in example (3880) (tdeo)
• Fix <TabbedShowLayout> documentation for scrollable tabs (3878) (tdeo)
• Convert <RichTextInput> to a functional component (3875) (m4theushw)
• Fix broken links in Data Provider docs (3874) (WiXSL)
• Fix custom user menu does not close after selecting an item in the demo (3868) (fzaninotto)
• Fix theme can't be changed dynamically (3867) (fzaninotto)
• Fix various typos in the docs. (3861) (WiXSL)