v12.0.1-rc.1

Full Changelog

• Fix broken /messages filtering due to internal field changes in
  FilterComponent
  #1759
• Convert crypto index to TS
  #1749
• Fix typescript return types for membership update events
  #1739
• Fix types of MatrixEvent sender & target
  #1753
• Add keysharing on invites to File Tree Spaces
  #1744
• Convert Room and RoomState to Typescript
  #1746
• Improve type of IContent msgtype
  #1752
• Add PR template
  #1747
• Add functions to assist in immutability of Event objects
  #1738
• Convert Event Context to TS
  #1742
• Bump lodash from 4.17.20 to 4.17.21
  #1743
• Add invite retries to file trees
  #1740
• Convert IndexedDBStore to TS
  #1741
• Convert additional files to typescript
  #1736