#109255 - Add encoding description to settings "File: Encoding" drop-down

fixes #110282

* refactor dialog service to use model and contrib

* address comments

* make inputargs extend showargs, same as result

fixes #88217

Fixes #110042

Add updateTextFromFindWidgetOrSelection method to SearchView

* add alignment to custom context view
fixes #109681

* fix macOS

Clean up drop shadows

Part of #83592

Paste wasn't working in Firefox or other browsers not supporting
navigator.clipboard.readText because xterm.js would process the keystroke, send
it over to the shell and prevent the default (paste) from occurring. This change
Forces ctrl+v to be ignored by xterm.js' keyboard event processing for such
browsers, the keybinding won't be customizable but this seems to be the only way.

fixes #109057

Fixes #110321

Add support for word wrap in diff editor

word based completion includes words from other files of same language