[PT Run] WindowWalker: Refactor code, fix some bugs, hide UWP non-windows, prepare code for new features (#15441)

* Import files from old PR #15329

* Improvements

* hide uwp non-windows (#13637)

* update debug tool tip

* fix spelling and comments

* disable tool tip

* fix doc links

* remove obsolete using

* Update docs

* fix spelling

* rename elevation property and test method

* Add property <DoesExist> to WindowProcess class

* Close process handles correctly if not used anymore

* cleanup coed

* fix bug with sticky notes process

* add window class to tool tip

* small change

* make nativeMethods static class

* fix broken uwpApp property of WindowProcess class

* rename method

* Revert making NativeMethods class static. It contains instance members.

* improve loggign

* fix merge mistakes

* fixes

* remove obsolete delegate

* Improve SearchController to speed up search (#15561)

* add <IsShellProcess> property to <WindowProcess> class

* reorder code

* disable debug tool tip

* Update devdocs

* remove obsolete event handler

* update var name

.github/actions/spell-check/expect.txt

@@ -723,6 +723,7 @@ HOLDESC
 homepage
 homljgmgpmcbpjbnjpfijnhipfkiclkd
 HOOKPROC
+Hostbackdropbrush
 hostname
 hotkeycontrol
 hotkeys