RFR: WIP adding support for stdin

[Jiří Vaněk]

Now Added support for stdin in jdis. Before merging, I would like to add support to all four (not sure with jcdec) tools.
This PR serves for early feedback in approach. Hintsvery  welcomed. 

I personally miss stdin support in this toolchain. Also I think, that for any (test) wrapper, stdin will be much more comfortable then constantly create tmp files

As for the possibel future (test) wrapper, most likely custom stream implementation of ToolInput will arrive sooner or later.

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Commit messages:
 - Added support for stdin in jdis

Changes: https://git.openjdk.org/asmtools/pull/32/files
 Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=32&range=00
  Stats: 105 lines in 5 files changed: 90 ins; 4 del; 11 mod
  Patch: https://git.openjdk.org/asmtools/pull/32.diff
  Fetch: git fetch https://git.openjdk.org/asmtools pull/32/head:pull/32

PR: https://git.openjdk.org/asmtools/pull/32