Move AppendProperties and PrependProperties into TopDownMutatorContext
so that LoadHooks can be a subset of TopDownMutatorContext that also
includes CreateModule.
Test: m checkbuild
Bug: 35570956
Change-Id: Iffa6a6aec96f08821c2446e0e0f4622ab772b54c
Replace PropertyCustomizer with a more extensible hooks mechanism.
Instead of passing an object that satisifies an interface, pass a
function pointer that takes a context interface as an argument. Callers
can use lambdas to capture any other necessary parameters like property
structs.
Also add two new hooks, arch hooks that occur after splitting modules
into arch variants, and install hooks that occur each time a file is
installed to the output directory.
Change-Id: I3a3e34aa97f1a92d3a31e5004b4b1ba68869d242
