* Adding a type to represent the EPICS types of channels we deal with so it can be abstracted from the iocsh and CAS/CA versions of the types.
 * the channel access varient of the sequencer builds again.

 * Reworking the simpleIntPv and simpleIntAttribute interface to be templates to allow for semi-arbitrary int PV types.
   * Done to support int, uint, ushort types in the epics sequencer.

 * test_casdf_seq -> casdf_seq
 * test_seq -> model_seq

* Added test builds of the sequencer to the cmake to facilitate building and debugging (non-functional as it does not build the dbd file, cmd file, ...
* Wrap the local EPICS variables in a new type to promote type safe read/write of data, plus give us a point to allow mocking the interface out.
* the casdf sequencer does not build right now.

The sequencer now builds for both regular models and slow controls sdf.

Added a simple_range abstraction (a container for a begin/end iterator pair) as a view over the fixed_size_vectors.

Also added some more checks for fixed_size_string to ensure it can meet the requirements to be in the vector.

* Not pervasive yet, but used in all the table structures and many functions.
* Extended the fixed_string class with functions as needed.

goal:
 * increase abstraction and make code easier to read
 * take advantage of stronger type system

The TrueRMS.pm part adds window sizes after the header \#endif in the MODEL.h...

See merge request cds/advligorts!339

The TrueRMS.pm part adds window sizes after the header \#endif in the MODEL.h header. Moving endif print to right before the header file close so they are contained.

Adding better log messages when module is in verbose mode, removing extra shmem...

Closes #386

See merge request cds/advligorts!336

Merging 4.2 into master

Closes #369 and #332

See merge request cds/advligorts!332

Six channels are created by the EDCU.  Only three were sent to both EPICS and the data stream.
 * Update the standalone_edcu to export the UPTIME, GPS, and DATA_RATE_KB_PER_S values in EPICS as well.
 * Minor formatting changes as per clang-format run.

Closes #332

Adding error message and catching some errors instead of letting the program segfault

See merge request cds/advligorts!330

awgtpman: shore up synchronization with IOP

See merge request cds/advligorts!329

When waiting for testpoint manager to load.

Automatically trigger burt restore when a snap file is loaded.

See merge request cds/advligorts!328

Several steps were taken to shore up synchronization of awgtpman to the IOP.  These steps do not directly address the crash in issue in #377, but by
blocking execution until the model is fully running, they may prevent the crash from ever happening.

1. Ignore negative card counts from the IOP.  This obviously indicates the IOP isn't loaded.
2. Block execution of a seemlingly loaded IOP until cycle counter is seen to change.  The cycle counter doesn't start updating until the
IOP is fully loaded.
3. Allow up to a minute for an IOP to fully load, then exit nicely.

Changed from using an environment variable to using a function interface for setting sdf_file_loaded

This bypasses the frustrating cases where a snap file (particularly safe.snap) doesn't set the right BURT_RESTORE variable.

changing var to match the expected argument to gainRamp

See merge request cds/advligorts!326