This (officially) drops VS2013 support and updates some code and some comments accordingly.
Note: The commit will also delete the following files, which arcanist is too stupid to mark as deleted without wanting to upload their current version (??)
D binaries/system/mozjs45-ps-debug-vc120.dll D binaries/system/mozjs45-ps-debug-vc120.pdb D binaries/system/mozjs45-ps-release-vc120.dll D binaries/system/mozjs45-ps-release-vc120.pdb D libraries/source/spidermonkey/lib/mozjs45-ps-debug-vc120.lib D libraries/source/spidermonkey/lib/mozjs45-ps-release-vc120.lib