Make -d and -classpath options backwards compatible with the scala command

[Gedochao]

Context: #1310

Summary of changes (most of them, breaking changes):

• the compile sub-command's --output option has been renamed to --compilation-output
  • the --compilation-output option is now also available from the run and package sub-commands
  • the rename is necessary to prevent a clash with the --output option of the package sub-command
• the -d option is no longer an alias for --dependency, but for --compilation-output
  • the aim of that change is to be backwards compatible with scala command's -d
• -O -d -O path/to/compilation/output now defaults to -d path/to/compilation/output
• the old --classpath option has been renamed to --print-classpath, to better reflect what it actually does
  • the rename is necessary to prevent the near-clash between scala-cli's --classpath and scala command's -classpath options (which have radically different meanings, BTW)
• --classpath, --class-path and -classpath options are now aliases for the --extra jars option
• -O -classpath -O path/to/classpath now defaults to --extra-jars path/to/classpath

Reference docs have been generated for each of the commits, separately.