RFR: 6945: Create build script for Windows [v2]

[Jean-Philippe Bempel]

> Build script for windows mimics behavior of the *nix one
> 
> Special handling for Jetty server with killing it at the end of the action

Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:

  Use another method to get timestamp
  
  also kill jetty when core installation fails
  reformatting code

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/147/files
  - new: https://git.openjdk.java.net/jmc/pull/147/files/a435fa9f..3d2c8134

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=147&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=147&range=00-01

  Stats: 17 lines in 1 file changed: 1 ins; 2 del; 14 mod
  Patch: https://git.openjdk.java.net/jmc/pull/147.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/147/head:pull/147

PR: https://git.openjdk.java.net/jmc/pull/147