RFR: added handling of zips, implants [v7]

[Alexandre Iline]

> Instr updated to handle zips and implants with the plugin

Alexandre Iline has updated the pull request incrementally with three additional commits since the last revision:

 - Agent is not functional. Removed.
   Fixed ProductInstr and Exec.
 - Removed unused import
 - Instr2 is just like Instr

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Changes:
  - all: https://git.openjdk.org/jcov/pull/34/files
  - new: https://git.openjdk.org/jcov/pull/34/files/ceb5560e..e0540ace

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jcov&pr=34&range=06
 - incr: https://webrevs.openjdk.org/?repo=jcov&pr=34&range=05-06

  Stats: 1269 lines in 6 files changed: 117 ins; 1117 del; 35 mod
  Patch: https://git.openjdk.org/jcov/pull/34.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/34/head:pull/34

PR: https://git.openjdk.org/jcov/pull/34