OSL v1.12.7.0

Release 1.12.7.0 -- 1 Nov 2022 (compared to 1.12.6.2)

• Optix: Change naming of certain compiler-generated constants in a way that
  improves use of the PTX cache. #1570
• Batch: Fix uninitialized members in ReadEvent internals. #1575
• testshade --help now prints TextureSystem options and hardware info. #1584
• oslc: Fix memory leak in ASTvariable_declaration. #1576
• Fix memory leaks in light path expression code. #1593 #1594
• Include the immintrin.h header only when needed. #1605
• icx: Improvements to fix problems exposed by new icx 2022.2 compiler. #1601
• Testing: CMake cache variables to control the testing timeout length. #1571
• CI: Add a dynamic analysis test using address and leak sanitizers. #1581
• CI: Now using SonarCloud static analysis. #1551
• CI: Many improvements in testing code coverage #1607
• CI: Make sure to run pointcloud tests when partio is found. #1611
• Developers: platform.h now defines OSL_ALLOCA macro. #1589
• Developers: platform.h now defines OSL::bitcast utility. #1610