New EEPROM blocks and improved(?) existing block. Label and description changes

(1) Improved existing EEPROM block only wrote constants. (AFAICT)

(2) New blocks to read/write ints and longs to EEPROM

Possible problems...
I've basically just guessed that 'addDefinitionCommand' is what I need to add a function in the correct place in the generated C code? Works OK for now but I don't know if anything might break that.

I've removed some stuff that checked 'context' in the original, write-a-byte, code as I couldn't get it to work and I couldn't work out what it's supposed to do.

My bg.....description strings are getting so long I need to increase to time pop-ups are on screen and I don't know how to do that.

I've ordered the blocks in the draw to suit me - don't know if that makes sense to other people?