Fix newlines.
Use correct names for slice+X functions.
Add support for print_item,print_newline.

Fix emitted bytecodes for slice,store_slice,delete_slice.

Add support for 5 register bytecodes (yech).

Inline usages of r1,r2,r3.. to avoid accidentally using an invalid
register from another case.

Switch to 8 bit registers, 255 is flagged as the invalid register.