Profiling: Switch logging over to the new PetscLogHandler infrastructure

- Move data structures only needed by the default logger now (Action,
Object) to logdefault.c

- Create petsclogdeprecated.

Profiling: Switch logging over to the new PetscLogHandler infrastructure

- Move data structures only needed by the default logger now (Action,
Object) to logdefault.c

- Create petsclogdeprecated.h and petsc/private/logimpldeprecated.h
for publicly visible symbols that are now deprecated. Yes,
lots of symbols in petsc/private/logimpl.h were not only visible
but had docstrings.

- The macros PetscLogEventBegin(), PetscLogEventEnd(),
PetscLogEventSync(), PetscLogObjectCreate(), and
PetscLogObjectDestroy() now looks through the log handlers
in PetscLogHandlers, sees if they have they appropriate
callbacks (Exposed in PetscLogHandlerHot), and calls them.
Up to 4 log handlers can run simultaneously.

- All queries about the registered things now go through
petsc_log_state.

- Output functions dispatch to the appropriate PetscLogHandler

- There is no need for xmllogevent.c, xmlviewer.c, eventlog.c,
classlog.c, and stagelog.c anymore. Some orphaned functions
(PetscLogSetThreshold(), PetscLogEventSetDof(),
PetscLogEventSetError(), PetscASend(), PetscARecv(), PetscAReduce())

- PetscFEOpenCLLogResidual() did some intrusive things related
to the old logging infrastruture: the private header
for the default log handler is now imported into feopencl.c
so that it can do equivalent things with the new infrastructure.

- PetscLogPauseCurrentEvent_Internal() is replaced with
PetscLogEventsPause()

Deprecated symbols include:

- All functions related to PetscStageLog and the resizable array structs
that it contained.

- The legacy EventBegin()/EventEnd() callbacks.

- PetscLogAllBegin(), which actually reported less information than
PetscLogDefaultBegin() because it was not kept up-to-date with
regards to GPU profiling.

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Rename PetscValidPointer -> PetscAssertPointer

Deploy new PetscValidPointer, remove PetscValidXXXPointer

Plex: Fix orientation when integrating cohesive faces
- Need to incorporate orientation of endcaps
- Fix debugging output

FE: Protect against 0-dim calls