3.5.0 Release Candidate 1

This release fixes introduces the remaining new features planned for the 3.5 release cycle and fixes bugs in 3.5.0-beta4. Highlights include:

• Experimental support for LDC1612-based scanning Z probes connected to tool boards and SAMMYC21 boards
• New fileread function for reading single-line CSV files
• Improved input shaping, in particular for short moves
  See https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-RC#reprapfirmware-350-rc1-changes-since-350-beta4 for the change list and upgrade notes. You can use the DWC ReleaseMgr plugin to highlight changes that are likely to affect your machine.

User of Duets with attached Single Board Computer, please update from the unstable feed on the package server. Users of Duets in standalone mode, use the files here. The WiFi module files are unchanged from 3.5.0-beta.4.