RFR: 8264293: Create implementation for NSAccessibilityMenu protocol peer [v2]

[Alexander Zuev]

> Added implementation for all menu related protocol peers;
> Native methods moved to CommonComponentAccessibility so they are called on correct peers;

Alexander Zuev has updated the pull request incrementally with two additional commits since the last revision:

 - Fixed parameters layout for better readeability;
 - Fixed indentation of native methods;
   Fixed initial capacity of rolesMap dictionary;

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6421/files
  - new: https://git.openjdk.java.net/jdk/pull/6421/files/264f8ee6..cedec290

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6421&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6421&range=00-01

  Stats: 13 lines in 1 file changed: 1 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6421.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6421/head:pull/6421

PR: https://git.openjdk.java.net/jdk/pull/6421