Merge pull request assimp#4527 from motazmuhammad/master

Accelerate the Merge vertex post processing step

Merge pull request assimp#4451 from Promit/promit/gltf-attrib-bug-fix

GLTF2 attribute name/parse bug fix

Merge pull request assimp#4393 from TerenceRussell/master

Added support for "map_Bump -bm"

Merge pull request assimp#4376 from assimp/kimkulling-lwo-enum-valida…

…tion_issue4236-1

LWO: validate enum value before parsing it

Merge pull request assimp#4375 from assimp/kimkulling/introduce_compr…

…ession

Introduce compression class to encapsulate compression via zlib

Merge pull request assimp#4353 from assimp/kimkulling-preparation_v5.2.0

Udate version to 5.2.0

Merge pull request assimp#4333 from assimp/kimkulling-prepare_v5.1.6

Update to 5.1.6

Merge pull request assimp#4272 from errissa/pbr-obj

Support PBR properties/maps in Obj importer

Merge pull request assimp#4266 from assimp/kimkulling-patch-1

Update version to 5.1.4

Merge pull request assimp#4219 from assimp/kimkulling-v5.1.3

Update CMakeLists.txt