Switch to makebin

[basxto]

This is little bit bugged.
Instead of setting $014C to 1, it sets $0000 to 1 due to a bug in 4.1.0 makebin.
But as far as I can tell, that does not impact the game.

[basxto]

This further does:

• Make it easy to just compile and run the game with commands like make run EMU=emulicious
• Allow to run with snapshots, that aren’t properly installed (for testing new SDCC versions)

It will not actually run with the current snapshots due to lacking backwards compatibility:

• -mgbz80 renamed to -msm83
• new calling convention breaks functions written in assembly
• completely falling back to old convention is only theoretically possible because library is only compiled with the new one

But it’s possible to explicitly fall back per function.

[basxto]

• Rename a few variables according to https://www.gnu.org/software/make/manual/html_node/Implicit-Variables.html
• Use bbbbbr’s romusage tool to be able to compare rom size created by different versions of SDCC
• Generate .cdb file (emulicious can use this for c-level debugging; romusage can use it for better statistics)