As noted on st.cmd, instead of naming records <Device>:HybN we will name
them <Device><N>:<Property> (So the number is actually part of the
device).

So records with two digits refer to the whole IOC, records with three
digits refer to hybrid-specific parameters and records with four digits
refer to VMM3A specific parameters.

This commit was done with an inescrupulous "git add ." after several
radical modifications.

Anyway, the API was radically modified and basically the old way the
code worked does not make any sense anymore.

The desired architecture is the following: the API is going to be used
as a class component. Each parameter will be created according to the
desired number of enabled hybrids.

Each parameter should use one simple API function. No information about
the VMM or hybrids itself is stored in the VMMTbl class unless extremely
needed.

This commit leaves a few old parameters that should be removed in the
future such as ADC_VALUE_VMM1, READ_ADC_VMMS, etc. This is only to serve
as a reminder to add those later.

Before this, Any caput to AllST-S record would only set channels values to
hybrid 0, vmm 0 because of hardcoded values.

This commit makes the vmmST_ an array with epics parameters.
The function getPair discovers the HYBRID-VMM pair for the parameter
that was called and sets the correct pair register's values.

Also, records are loaded with .sub files so we don't need to keep repeating
record names with different numbers.

All have been tested and works.

Before this, you would need to put array of values into ST-S.
Now you can simply put 1 or 0 into AllST-S and it will set all channels.

OOPT "on change" field is needed because for some reason without it even
if you put PINI=NO in all these three ST-S records, it processes on IOC
initialization, which I don't think is desired.

Add array of 64 elements. When you put into it, the nth element will
set the nth ST channel of VMM to the value put to it.

Added writeInt8Array method.
Added the ST-T aao record.
Added vmmST parameter to VMM class.
Removed TO-DO comment that was about adding this functionality.