Gns3-gui

* Upgrade embedded Python to version 3.7 in Windows package
* Upgrade Visual C++ Redistributable for Visual Studio 2019 in Windows package
* Fix SSL support in Windows package
* Open "template configuration" dialog with double click on template name in "Preferences". Fixes 3239
* Only show "virtio" network adapter when legacy node is enabled. Fixes https://github.com/GNS3/gns3-gui/issues/1969
* Double-click on a template opens "template configuration" dialog. Fixes 3236
* Fix "Custom symbols" can't be unfolded after using "Filter" field. Fixes 3231

* Fix menu disabled for modal dialogs on macOS. Fixes 3007
* Change method to display the recent files menu. Fixes 3007
* Fix bug when using empty port names for custom adapters. Fixes 3228
* Upgrade Qt to version 5.15.4 on macOS
* Fix mouse zoom-in/out step value is two times bigger than keyboard one. Fixes 3226
* Upgrade to Qt 5.15.4 on Windows. Ref 3210
* Fix issue with custom adapters at the node level. Fixes 3223
* Explicitly require setuptools, utils/get_resource.py imports pkg_resources

* Fix incorrect Qemu binary selected when importing template. Fixes https://github.com/GNS3/gns3-gui/issues/3216
* Early support for Python3.10
* Bump pywin32 from 300 to 301
* Add PyQt5==5.12.3 for macOS build

* Handle -no-kvm param deprecated in Qemu >= v5.2
* Support for invisible links. Fixes 2461
* Add kitty console application command line. Fixes 3203
* Add Windows Terminal profile as an option for Console Applications. Fixes 3193

* Fix exception shown when GNS3 is started with empty config. Fixes 3188
* Add ZOC8 console terminal for macOS command line
* Link style support. Fixes https://github.com/GNS3/gns3-gui/issues/2461
* Fix charcoal theme. Ref 3137
* Fix issue when showing menu to select port. Fixes 3169

* Fix issue with empty project variable name. Fixes 3162
* Downgrade to PyQt5 5.12.1. Fixes https://github.com/GNS3/gns3-gui/issues/3169