VM storage options and fixes for input, networking, and setup

[jamesstringer90]

Changes since v0.1.4.

Added

• Choose where VM disks are stored when creating a sandbox on Windows or macOS, including on another drive. Requested in #12, #24, #38, #68, and #71.
• Automatic mouse capture for games and 3D applications in Windows and Ubuntu VMs.
• Keyboard shortcut capture and audio mute controls in the Windows VM viewer's title bar menu on macOS.

Fixed

• Improved international keyboard input and fixed keyboard layout setup in newly created Ubuntu VMs. #76
• Fixed host input methods intercepting typing and language-switching shortcuts when keyboard shortcut capture is enabled on Windows. #116
• Fixed incorrect mouse positioning when changing display scaling inside Windows VMs. #111
• Fixed distorted text cursors in the Windows viewer at high DPI scaling settings.
• Fixed copying text from Ubuntu Terminal to the host clipboard.
• Fixed NVIDIA driver-profile errors preventing games such as Counter-Strike 2 from starting. Addresses the NVIDIA profile error in #73.
• Fixed Windows installation images being incorrectly detected as English on non-English hosts. #84
• Fixed NAT internet connectivity in Windows VMs with localized network adapter names. #79, #84
• Fixed external networking failing after saving adapter names containing non-English characters. #94
• Fixed saved NAT addresses being lost when VMs shut down.
• Fixed Windows VMs created from templates using the template's disk size instead of the size selected during creation.
• Fixed saved snapshots being modified when starting a VM after deleting a branch.
• Fixed snapshot controls remaining visible after all snapshots and branches were deleted.
• Fixed Windows installation getting stuck when the username matches the VM name. #103
• Improved VM creation checks for invalid usernames and missing passwords.
• Fixed VM table columns shifting when switching operating systems in the creation window.