Multipass for Mac

• Modifying instances is now supported. You can modify the number of cores, memory, and disk space allocated to an instance. Note that instances can only be modified when they are not running and disk space can only be increased.
• On Windows, Multipass now supports creating generation 2 virtual machines in Hyper-V along with disabling dynamic memory. These apply only to new instances launched and not existing instances.
• Specifying mounts at launch time is now possible via multipass launch --mount.
• It's now possible to use a URL when using the --cloud-init option in launch.
• There are few enhancements to the multipass exec and multipass alias commands.

More highlights:

• Launching an instance using the lxd driver will now use the general cloud image instead of the KVM image. This is due to the KVM kernel in the image having unfixed bugs. (#2491)
• multipass transfer now handles a directory being a target. (#1165)
• The Multipass icon is now shown in the "Windows Apps & Features" Multipass entry. (#2595)
• It's now possible to unalias all defined aliases at once. (#2298)

Notable bug fixes:

• LXD VMs constructed with wrong storage pool on daemon startup (#2591)
• [lxd] long startup delay due to image refresh (#2516)
• [macos/qemu] Multiple qemu processes running for the same instance (#2592)
• multipass launch --help-all launches an instance (#2635)
• [blueprints] No error message when Blueprint name doesn't match instance name in yaml (#2542)