CE low level HDD IF moved to library

[atarijookie]

The source files for ACSI and SCSI access were copied to all those CE ST apps when they were developed. While working on cart interface I've remade them and moved those ACSI and SCSI sources to ce_hdd_if library. As the work on cart version is now postponed because of floppy related tasks, and (which I hope won't happen) I might not work on the cart version soon, I wanted to have this improvement (with hdd IF library) in master, I've extracted that into separate branch:
origin/hddif -- https://github.com/atarijookie/ce-atari/tree/hddif
It compiles fine with the ST apps, I just need to compile and test them on ST, but once I'll test it, I will merge it into master...

[atarijookie]

One nice feature, which should / could be used in CE_FDD.PRG would be:

• add a way how the BYTE findDevice(BYTE whichIF, BYTE whichDevType) would output everything into dialog, which would be opened only if required - most of the apps could keep their console output, but CE_FDD.PRG with GEM windows would have a nice find device dialog.

Requirements on this feature:

• can use console output or GEM window
• if GEM output is required, GEM should be already initialized when this is called
• no resource file should be required for this - construct minimal tree using objc_add()