Implement GetLoadAddress for the Windows process plugin

Summary:
When a process is loaded, update its sections with the load address to resolve any created breakpoints. For the remote debugging case, the debugged process is launched remotely so GetLoadAddress is intended to pass the load address from remote to LLDB (client).

Reviewers: zturner, llvm-commits, clayborg, labath

Reviewed By: labath

Subscribers: mgorny, sas, Hui, clayborg, labath, lldb-commits

Differential Revision: https://reviews.llvm.org/D56237