ST register is not hardcoded into template file anymore.
This will make it easier to add new registers, I hope.

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.

In this moment we are using only hybrid 0, this must be changed in the future