RFR: 7268: Should show icons for modifiers in the Method Profiling page

[Marcus Hirt]

I'll check in the new icons in the jmc-graphics repo.

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Commit messages:
 - Adding new icons
 - 7268: Should show icons for modifiers in the Method Profiling page

Changes: https://git.openjdk.java.net/jmc/pull/264/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=264&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7268
  Stats: 72 lines in 21 files changed: 64 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jmc/pull/264.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/264/head:pull/264

PR: https://git.openjdk.java.net/jmc/pull/264