[jmc-graphics] RFR: 7271: Add method related graphics to jmc-graphics

[Marcus Hirt]

Vector and icons.

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Commit messages:
 - 7271: Add method related graphics to jmc-graphics
 - Icon for the graph view

Changes: https://git.openjdk.java.net/jmc-graphics/pull/4/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc-graphics&pr=4&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7271
  Stats: 56 lines in 29 files changed: 56 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc-graphics/pull/4.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc-graphics pull/4/head:pull/4

PR: https://git.openjdk.java.net/jmc-graphics/pull/4