[Windows] Move existing InstallShield installer to the WiX Toolset

[AenBleidd]

This tasks is blocked by #5064

Currently there are two installers that could be generated with the InstallShield:

1. BOINC x64
2. BOINC x64 with VirtualBox

As a result of this task 3 WiX Toolset projects should be made with the next configurations:

• BOINC x64
• BOINC x64 with VirtualBox
• BOINC ARM64

These projects should be integrated into the existing MSVS solutions as a 2 separate projects:

• BOINC Installer
• BOINC Installer with VirtualBox (this one should be enabled for the x64 configuration only)

Resulting installer should...:

• ...be a MSI installer (or MSI packed inside the EXE as it done now with InstallShield)
• ...support all functions that are currently provided by the InstallShield installer
• ...have as similar interface as possible to the current installer
• ...provide a smooth UX (current BOINC users should be able to update their current BOINC installation with the new installer)
• ...be built on the current CI (GitHub Actions)
• ...be signed with the provided certificate (contact @AenBleidd to add required GitHub Secrets)

Currently some custom actions are built inside boinccas.dll.

• New installer should use this DLL to reduce code duplication.
• It is allowed to implement required changes in this DLL by removing the current support of InstallShield project from it.
• Current InstallShield project files should be removed

[AenBleidd]

According to the comparation table in #5064 , the best tool to use is WiX Toolset: https://wixtoolset.org/