~ Move UI to new FileSyncDialog class;
~ Improve UI responsiveness during operation (closes#5005);
+ Add log verbosity option (also helps with UI response);
+ Add several filtering settings in new "extra options" panel (include/exlude patterns, symlinks, recursive, empty folders);
~ Exclude patterns ".*" and "System Volume*" by default (addresses #5213, #5106);
+ Sanity check file timestamps when using date comparison, future dates are invalid (addresses #5735);
~ Folders are no longer included in file counts (total/created/etc);
~ Ignore unreadable files/dirs (also enables NTFS permissions check);
~ Switch from QMutex to QReadWriteLock.
~ All stored properties are fully dynamic, using an extended version of the Qt Property System;
~ CompStoreObj is now QObject subclass;
+ All properties now have change notifier signals;
~ Do not store default values in settings;
+ Add _reset() and _default() functions for each property;
+ Settings import now ignores all non-existent properties automatically;
+ Add settings export functions;
+ Add more version macros;
~ Remove template functions;
~ Move DownloadBranchType and create NewModelAction enums and register with Qt meta system;
~ Multiple efficiency and optimization changes (const functions, literals, etc).
* [companion][build][Windows] Refactor 'install' and 'installer' targets: Use qtwindeploy to collect Qt dependencies; 'install' with WIN_DO_FULL_INSTALL=YES now really copies everything needed; Simplified NSIS script, now also supports MinGW build; Refactor libeay search.
* Rename nsis input script.
* Fix NSIS input script name in CMakeLists.txt.
* [Companion][build] Create new Windows icon with more sizes; move icon files out of src root.
* [CompanionIcon] Can now add multiple image files to icon for representing different UI states (checked/active/etc).
* [Companion][CustomFunctionsPanel] Fix sound file locked after playback (fixes#5222, fixes#5997); Refactor play button (fixes#4929); Create new QMediaPlayer on each play and load in "LowLatency" mode instead of stream.
* [Companion][LogsDialog] Use relative path for Google Earth track icon (fixes#5080); Use detached process to launch GE (does not restart GE for every export, does not keep handle to GE process); Fix typo in warning message.
* [LogsDialog] Use GE export file path as base for icon path (don't assume TempDir); Fix auto-connection warning from Qt due to misnamed function; Remove redundant check for existing GE file.
