New features:
* The syscall pass now resolves syscalls for the input target, provided
that an OS is mapped on the ROM region.
* Formalized the variations of print's arguments as a sequence (tree, to
be precise) of /promotions/.
* Added a short notion of Symbol and SymbolTable, and a loader for them.
Data files of type "symbol" are read as such and provide name to
syscalls or arbitrary addresses.
Code changes:
* The disassembly operation of the command-line interface is now finally
in its own file with more room.
* Encoded the tree structure of promotions as a sequence of (mainly
tail-calling) inter-calling methods in the print pass.
Lephenixnoir