Use macros instead of repeat generation on PVs

[evalott100]

Currently we generate multiple bobfiles for instances of the same screen.

For example, COUNTER[N].bob is generated 8 times.

We should instead generate one COUNTER.bob containing PVs with a macro $(N), then make buttons to open the file with a given $(N) from index.bob.

We should do this with all screens which are repeated - currently every one except for

• BOB
• PCAP
• HDF5
• SYSTEM