Add "Create Desktop Entry" Selector box

[groovy-boiler]

Description:
I would like to propose the addition of a clickable setting box in the Firo-Qt wallet that allows users to easily create a desktop entry for the application. This feature would enhance user experience by providing a straightforward way to add the wallet to the desktop environment, making it more accessible.

Proposed Implementation:

• Add a checkbox in the settings menu labeled "Create Desktop Entry".

• When checked, the application should:
  1. Create a .desktop file at ~/.local/share/applications/firo-qt.desktop with the following content:

  [Desktop Entry]
  Comment=Firo-Qt Full Node Wallet 
  Exec=path to location of this extracted folder/firo-qt
  Icon=~/.local/share/icons/hicolor/scalable/apps/firo-qt.svg
  Name[en_US]=Firo-Qt Wallet
  Name=Firo-Qt
  Categories=Finance;Network;
  StartupNotify=true
  Terminal=false
  Type=Application
  

  2. Install the Icon: Copy the firo.svg icon from the binary to ~/.local/share/icons/hicolor/scalable/apps/firo-qt.svg.

• If the user unchecks the box, the application should remove the existing
  desktop entry if it was created previously from selecting it.

Benefits:

• Simplifies the process for users who may not be familiar with manually creating .desktop files.
• Increases the visibility and accessibility of the Firo-Qt wallet on the user's desktop environment.
• This would not require root permissions since it would be in the home folder.
• This also would be flexible for Tails users, allowing them to copy the ~/.local/share/applications/firo-qt.desktop and the ~/.local/share/icons/hicolor/scalable/apps/firo-qt.svg to their dotfiles folder.

Additional Notes:

• This feature could be particularly beneficial for new users who may not know how to create a desktop entry manually.
• Would benefit all users of the linux releases and make starting Firo-Qt wallet more convenient
• It would be great to have a confirmation dialog to inform users that the desktop entry has been created or removed.

Disclaimer:
I'm not sure how exactly this could be implemented for the windows release but maybe something like the Windows Shell API to create the shortcut launcher:

#include <windows.h>
#include <shobjidl.h> 

void CreateShortcut(const std::wstring& shortcutPath, const std::wstring& targetPath, const std::wstring& iconPath) {
    CoInitialize(nullptr);
    IShellLink* pShellLink = nullptr;
    HRESULT hres = CoCreateInstance(CLSID_ShellLink, nullptr, CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID*)&pShellLink);

    if (SUCCEEDED(hres)) {
        IPersistFile* pPersistFile = nullptr;
        pShellLink->SetPath(targetPath.c_str());
        pShellLink->SetIconLocation(iconPath.c_str(), 0);
        
        hres = pShellLink->QueryInterface(IID_IPersistFile, (LPVOID*)&pPersistFile);
        if (SUCCEEDED(hres)) {
            pPersistFile->Save(shortcutPath.c_str(), TRUE);
            pPersistFile->Release();
        }
        pShellLink->Release();
    }
    CoUninitialize();
}