Jiminy release 1.8.8

[duburcqa]

• [core] Fix robot serialization issue. ([gym/common] Refactor quantity management to dramatically improve its performance. #821)
• [core] Minor improvement periodic Perlin process and periodic stair ground. ([core] Add Perlin ground profile generators. #799)
• [core] 'PeriodicGaussianProcess' and 'PeriodicFourierProcess' are now differentiable. ([core] Add Perlin ground profile generators. #799)
• [core] Fix negative time support for all existing random processes. ([core] Add Perlin ground profile generators. #799)
• [core] Add N-dimension Perlin processes. ([core] Add Perlin ground profile generators. #799) ([core] Faster Perlin process evaluation. #823)
• [core] Add gradient computation for all Perlin processes. ([core] Add Perlin ground profile generators. #799) ([core] Faster Perlin process evaluation. #823) ([core] Various cleanup and bug fixes of Perlin processes. #825)
• [core] Make all Perlin processes faster and copy-able. ([core] Add Perlin ground profile generators. #799)
• [core] Add Perlin ground generators. ([core] Add Perlin ground profile generators. #799)
• [core] Replace MurmurHash3 by xxHash32 which is faster. ([core] Faster ground profile querying. #824)
• [core] Make gradient computation optional for heightmap functions. ([core] Faster ground profile querying. #824)
• [jiminy_py] Fix 'tree.unflatten_as' mixing up key order for 'gym.spaces.Dict'. ( [jiminy_py] Fix 'tree.unflatten_as' mixing up key order for 'gym.spaces.Dict'. #819)
• [python/simulator] Consistent keyword arguments between 'Simulator.build' and 'Simulator.add_robot'. ([gym/common] Refactor quantity management to dramatically improve its performance. #821)
• [python/viewer] Fix MacOS support. ([python/viewer] Fix MacOS support. #822)
• [python/viewer] Add support of user-specified extra cameras (rgb and depth). ([python/viewer] Add support of user-specified extra cameras (rgb and depth). #826)
• [python/viewer] Significantly speed-up both offscreen and onscreen rendering for Panda3D. ([python/viewer] Add support of user-specified extra cameras (rgb and depth). #826)
• [gym/common] More generic stacking quantity. ([gym/common] Add termination condition abstraction. #812)
• [gym/common] Add termination condition abstraction. ([gym/common] Add termination condition abstraction. #812)
• [gym/common] Add quantity shift and drift tracking termination conditions. ([gym/common] Add termination condition abstraction. #812)
• [gym/common] Add support of termination composition in pipeline environments. ([gym/common] Add termination condition abstraction. #812)
• [gym/common] Add base roll/pitch termination condition. ([gym/common] Add several termination conditions.  #813)
• [gym/common] Add base relative height termination condition. ([gym/common] Add several termination conditions.  #813)
• [gym/common] Add foot collision termination condition. ([gym/common] Add several termination conditions.  #813)
• [gym/common] More generic actuated joint kinematic quantity. ([gym/common] Add safety limits termination condition. #814)
• [gym/common] Add multi-ary operator quantity. ([gym/common] Add safety limits termination condition. #814)
• [gym/common] Add safety limits termination condition. ([gym/common] Add safety limits termination condition. #814)
• [gym/common] Add robot flying termination condition. ([gym/common] Add robot flying termination condition. #815)
• [gym/common] Add power consumption termination condition. ([gym/common] Add several termination conditions. #816)
• [gym/common] Add ground impact force termination condition. ([gym/common] Add several termination conditions. #816)
• [gym/common] Add base odometry pose drift tracking termination condition. ([gym/common] Add several termination conditions. #817)
• [gym/common] Add motor positions shift tracking termination condition. ([gym/common] Add several termination conditions. #817)
• [gym/common] Add relative foot odometry pose shift tracking termination conditions. ([gym/common] Add relative foot odom pose shift tracking termination conditions. #820)
• [gym/common] Add unit test checking that observation wrappers preserve key ordering. ([gym/common] Add relative foot odom pose shift tracking termination conditions. #820)
• [gym/common] Fix quantity hash collision issue in quantity manager. ([gym/common] Refactor quantity management to dramatically improve its performance. #821)
• [gym/common] Refactor quantity management to dramatically improve its performance. ([gym/common] Refactor quantity management to dramatically improve its performance. #821)
• [gym/common] Add 'order' option to 'AdditiveReward'. ([gym/common] Refactor quantity management to dramatically improve its performance. #821)
• [misc] Fix missing compositions documentation. ([gym/common] Add termination condition abstraction. #812)