RFR: 8334739: XYChart.x/yAxisProperty returns incorrect bean [v2]

[Markus Mack]

> This PR makes the `XYChart` axes properties return the correct parent XYChart object.

Markus Mack has updated the pull request incrementally with one additional commit since the last revision:

  Set correct bean for properties in AreaChart / StackedAreaChart

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1485/files
  - new: https://git.openjdk.org/jfx/pull/1485/files/25610ea1..761c82a2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1485&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1485&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1485.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1485/head:pull/1485

PR: https://git.openjdk.org/jfx/pull/1485