Profiler code cleanup

- Put Profiler, ProfileSection and TransactionProfiler in their own
  files and rely on Autoloader to use them (maintenance has been
  using the autoloader here for some time--we don't profile the
  autoloader manually)
- This reduces overhead in WebStart/doMaintenance by only loading
  three functions at profiler initialization and defers until the
  first profiling call happens
- Inline callback functions in ProfilerSimpleText rather than having
  public static functions.
- Small comment and code formatting changes in various touched files.

Change-Id: Idf27677c068c50b847152c523a33e7f0c33fdeeb
Merge "Profiler code cleanup"