[Dev file previewer]Various improvements (#18259)

* Made file too big string variable

* Performance improvements

* Add progress bar to indicate loading

* Added Logging

* Added name to log files

* Push

* Updated expect.txt

* Push

* * Fixes small bug I sometimes encountered by unloading the application
* Fixes bug where sometimes the loading bar kept stuck (on "file is too big" screen

* Update expect.txt

* Resolved review comments
Added LogTrace() function

* Unifying tasks

* Removed unneccesary log message

* * Added margin to loading bar and text.
* Changed color of background to monaco dark skin color
* Centred loading bar

* Changed logger path

* Changed log path

* Fixed align of loading label

* Fix label size and position

Co-authored-by: Stefan Markovic <stefan@janeasystems.com>

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

@@ -601,7 +601,7 @@ FILESUBTYPE
 FILESYSPATH
 filesystem
 FILETIME
-FILETYPE
+filetype
 FILEVERSION
 Filtergraph
 Filterkeyboard