Patch release for 2.0 that fixes incorrect behavior and improves the stability of the engine.

• Server crashes during startup with error messages related to threading 2248
• Non-standard C++ code leads to crash when using certain compilers (e.g., GCC 7) 2249
• Potential crashes immediately following an unrecoverable error situation when trying to report the error to the user 2251
• Removed duplicate IWAD spec for Heretic 1.3 / Shadow of the Serpent Riders
• Avoid special characters when autogenerating package IDs for data files (no spaces or double quotes)

• More graceful error handling in Windows Multimedia audio plugin

• Added build option DENG_ASSIMP_EMBEDDED to control whether the customized Assimp is built as a static library, or whether the system Assimp library is used instead

• Roadmap: 2.0.2
• 2.0.1 release notes
• 2.0 release notes