HP41 TULIP4041 update

[MeindertKuipers]

Good work assembling the TULIP and remember to have fun with it!

Let me share some of the things I am currently working on for the TULIP.
First of all, do not expect any new firmware updates anytime soon, unless there is a serious bug. I have been working on a file system in FLASH memory to handle ROM images and decided it is better to first get things organized and write down what I am going to do. Some time has now been spent on writing the documentation. After that I will go back to coding again. In the meantime I will be moving to another house and switching to a new computer, so please be a bit patient. At least I am now retired and work does not interfere anymore.

The next firmware update will be a big one and has the following new functionality:
- FLASH file system for ROM and MOD files (imported from the uSD card)
- plug and unplug ROM and MOD based ROM images
- supporting functions to manage images in FLASH, list, remove, update

After that the next version will focus on FRAM functionality:
- extension of FLASH file system for FRAM
- HEPAX support
- support for QROM (MLDL RAM) and HEPRAM

In between I will possibly add functionality to the tracer:
- mnemonics type choice
- pass or block samples in a user specified address range
- trigger, to start and end tracing at a user specified address
- add the current Bank to the trace listing

Furthermore some existing functionality needs to be fixed (non-critical):
- RFC and CMD handling of the PILBox emulation
- Enable HP-IL device mode support
- Fix the HP82143A printer emulation to ensure correct operation with the Printer Service Module
- Add non-graphic HP82143A printing to a terminal emulator (not a fix but something I want to have)

Issues, bugs or feature requests are best reported on my GitHub page, but do not hesitate to start a discussion here on the forum.