ClassifiedAnalysis now uses the sandboxes vector

... to find all sandboxed functions. Also fixed a bug whereby we were not correctly checking if the classified taint-colour of a value is a subset of the clearaces given to the sandbox.
CapabilityAnalysis also now uses sandboxes vector
AccessOrigin analysis now uses sandboxes vector
SandboxPrivate adapted to use sandboxes vector
Removed redundant code
More refactoring.

Moved code for computing privileged methods to SandboxUtils and also updated SandboxPrivateAnalysis to obtain per-sandbox callgates from Sandbox instances.
Added -soaap-emulate-performance cmd line option.

We now have a proper command-line flag for turning on instrumentation for performance emulation, rather than previously using a boolean variable.
Refactored loading dynamic call graph edges code.

This now lives in Utils/CallGraphUtils.{cpp,h}.