0.15.2: Maintenance Release

• Revert bidi changes to nodes and hide menu option until fixed Fixes #1024
• Let xml node set options both ways
• Bump serialport to use version 4
• gpio node handle multiple bits of data returned in one go
• HTTP In should pass application/octet-stream as buffer not string Fixes #1023
• Handle missing httpNodeRoot setting properly
• Config sidebar not handling node definition error properly
• Add minimum show time to deploy spinner to avoid flicker
• Add work-in-progress update button to palette-editor
• Add log.removeHandler function
• Add Crtl/Shift/p shortcut for manage palette
• Add spinner to deploy button
• Status messages from nodes in subflows not delegated properly Fixes #1016
• fix spelling in join node info
• Speed up tab scrolling
• Update delay burst test to be more tolerant of timing Fixes #1013