Changes in 20201102095541

Built from 32e8e923c61840edff53f58d2a29206f2c380d8c

..index..
Bug 1673885 R[Core:CSS Parsing and Computation]myvue.com breaks sometimes after a reload (Can't access rules of still-loading stylsheet)
Bug 1672547 R[Core:GFX: Color Management]qcms: Change some raw ptrs to references.
Bug 1674621 R[Core:GFX: Color Management]qcms: change some *mut to *const.
Bug 1674656 R[Core:GFX: Color Management]qcms: make lut_inverse_interp16 safe.
Bug 1674671 R[Core:Graphics: WebRender]Add some documentation about the architecture of glsl-to-cxx.
Bug 1674556 R[Core:Layout]Frequent TEST-UNEXPECTED-PASS | bugs/409659-X.html == bugs/409659-1-ref.html | image comparison, max difference: 0, number of differing pixels: 0
Bug 1673611 R[Core:Networking: HTTP]Make Http3Stream::WriteSegments be similar to nsHttpConnection::WriteSegments
Bug 1674095 R[Core:Networking: HTTP]Make some functions in nsHttpConnectionMgr private
Bug 1674418 R[Toolkit:Places]Properly handle conn.close() exception so we don't block async shutdown
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Changes to 9 bugs - 9 fixed.