Misc scalac options fixes

[Gedochao]

context: #1310
Summary of changes in this PR:

• added --scalac-verbose as an alias for -O -verbose
  • this is necessary, since plain -verbose clashes with Scala CLI's --verbose
• ensured -release, -encoding, -color, -feature, -deprecation and -nowarn don't require being passed after -O
• when -release and/or -target:<target> are passed with a different target JVM than --jvm, a warning will be logged
  • I initially intended to always redirect -release and -target:<target> to --jvm, but theoretically one may want to actually compile targetting one Java version and then run on another
  • thus, the warning makes it that little bit easier to notice the difference
  • this is all the more troublesome, as -target has been deprecated for a long while (and is unstable even for Scala versions which still allow this option); there is maybe a need for disambiguation in the future (unsure if it's worth the effort, though)
  • for most normal (sane) use cases, --jvm is the superior, more flexible option for scala-cli