Allow / (slash) to be used as separator with `--package-path` ...on systems where separator is different (e.g, Windows). This allows writing somewhat cross-platform scripts / makefiles (using make in Windows with MSYS2).

Fixing smalltalk launcher --help switch now shows complete help without error

1.7.2 Checking all powershell versions (pick first working one), detecting manual switch from a user, better handling of trucky batch characters Details: - fixing finding powershell (check for all versions and pick first one which is correct) in case the registry holds only powershell key, but is not valid powershell instance - Adding a simple manual_switch_detection variable to detect manual switch from user - make the launcher work better with tricky characters for cmd.exe (|, <, >, &)

launcher, unix: fix `--help` w.r.t out-of-tree build `$STX_EXE` is now full path.

launcher, unix: fixed specification of package path via environment Fixed four different bugs in definition of `STX_PACKAGEPATH` in UNIX launcher script. Interesting, how many mistakes could be done in a single, short line...

`smalltalk`: fix processing of `--vdb` option Allow usage of `--vdb` even if no `vdb` is found along `$PATH`. In that case, use `...stx --load jv:vdb --startup VDBStartup`.

`smalltalk`: remove trailing spaces from UNIX launcher script

Add support out-of-tree builds. This commit adds a support for out-of-tree builds, i.e, object files, executables and so on are writen to `$(OUTDIR)` (which defaults to `build/<BUILD_TARGET>` directory. This allows building Smalltalk/X from single source tree for multiple targets.

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