The Assimp v5.2.1 Bugfix-Release

What's Changed

• ASE: Fix warning unreachable code by @kimkulling in #4355
• HMP: Fix override during copying position data by @kimkulling in #4359
• use fully qualified namespace in byteswap macros by @umlaeute in #4367
• fix compilation with clangcl on windows by @malytomas in #4366
• Delete .travis.sh by @kimkulling in #4371
• Update ccpp.yml by @kimkulling in #4378
• LWO: validate enum value before parsing it by @kimkulling in #4376

Full Changelog: 5.2.0...v5.2.1