Support A21

• add electricTier2 trader stage requirement
• add journal entry on login
• add key bindings to instructions
• add recipe unlock to electronics magazine
• clarify/correct note about removing this mod
• clean large rotation values
• limit jump height to 1 block when on panel
• no longer stop jumping; needed for onGround check
• update console command for a21
• update panel height to 3 blocks for jump room
• update to a21 mod-info file format
• update to a21 references
• update to reference onGround vs bJumping (retired)

What's Changed

• Support A21 by @jonathan-robertson in #49

Full Changelog: 1.1.4...2.0.0