RFR: 8286872: Refactor add/modify notification icon (TrayIcon) [v4]

[Alexey Ivanov]

> Encapsulate the logic of adding or modifying a notification icon aka tray icon. This is to avoid code duplication between [`AwtTrayIcon::WmTaskbarCreated`](https://github.com/openjdk/jdk/blob/7b988b31c661c6e3e58cf8ced81732e40a79d4f5/src/java.desktop/windows/native/libawt/windows/awt_TrayIcon.cpp#L477) and [`AwtTrayIcon::_UpdateIcon`](https://github.com/openjdk/jdk/blob/7b988b31c661c6e3e58cf8ced81732e40a79d4f5/src/java.desktop/windows/native/libawt/windows/awt_TrayIcon.cpp#L796).
> 
> Separating adding and modifying the icon simplifies the methods, the actions are clearer: adding the icon requires sending `NIM_SETVERSION` message whereas modifying the icon doesn't.
> 
> To verify the code works as before, I used `TrayIconScalingTest.java`. I killed explorer.exe process to verify the notification icon gets added. Changing DPI of the main display updates the displayed icon as expected.

Alexey Ivanov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 18 commits:

 - Merge master
 - Inline AddTrayIcon and ModifyTrayIcon
 - Make SendTrayMessage private - it's used internally only
 - 8286872: Replace SendTrayMessage(NIM_MODIFY) with ModifyTrayIcon()
 - 8286872: Refactor add/modify notification icon (TrayIcon)
 - renamed method id variable
 - added ExceptionClear, fixed CI debug build issue
 - Merge branch 'master' into WinTrayIcon
 - reverted SystemTray changes
 - new changes - trayicon update triggered in WmTaskbarCreated
 - ... and 8 more: https://git.openjdk.java.net/jdk/compare/fc3edf24...44d20dc5

-------------

Changes: https://git.openjdk.java.net/jdk/pull/8749/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8749&range=03
  Stats: 26 lines in 2 files changed: 14 ins; 5 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8749.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8749/head:pull/8749

PR: https://git.openjdk.java.net/jdk/pull/8749