Merge branch 'master' into stable-5.10

* master:
  Update Orbit to S20201118210000 and add target for 4.18
  PacketLineIn: ensure that END != DELIM
  PacketLineIn: ensure that END != DELIM
  Allow to resolve a conflict by checking out a file
  Update Orbit to I20201111205634
  Document that setLastModified sets time of symlink target
  Fix bug in PerformanceLogContext
  Fix IOException occurring during gc

Change-Id: I2980552381d1ae61b9b2d81d7289de37d6bf4cae
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>