- Minidump diagnostics run from the crash processor will always use the PDB cache and the MDD from the main branch
- Reimplemented PDB cache to support UE4 releases that are stored on the network drive
- Cleaned up a bit code, removed old or obsolete functionality
- PDB Cache is disabled by default, can be only enabled through the command line (should fix issues related to "\\Device\\Harddisk3\\DR3", somehow caused by the bad flash device driver when F:\\ is a generic flash reader?)
#codereview Bob.Tellez, James.Hopkin, Robert.Manuszewski
[CL 2212226 by Jaroslaw Surowiec in Main branch]