Facilitate Portability

Just sharing my progress.

Qtractor.cpp line 159:

sLocPath = (QDir(QCoreApplication::applicationDirPath()).filePath("../share/qtractor/translations")); 

This allows Qtractor to always find the translations, even if the local installation directory changes.
You just need to respect the structure: bin | lib | share.

---

QtractorOptions.cpp line 72:

qtractorOptions::qtractorOptions(void)
    : m_settings([&]() -> QSettings {
        QString appDirPath = QCoreApplication::applicationDirPath();
        QString homePath   = QDir::homePath();

        QString app = QDir::cleanPath(appDirPath);
        QString home = QDir::cleanPath(homePath);

		// Comprueba si se esta ejecutando en local
        bool inHome = (app == home) || app.startsWith(home + QDir::separator());

        if (inHome) {
            QString confPath = QDir(appDirPath).filePath(QLatin1String("../Qtractor.conf"));
            return QSettings(confPath, QSettings::IniFormat);
        } else {
            return QSettings(QTRACTOR_DOMAIN, QTRACTOR_TITLE);
        }
    }())
{
    g_pOptions = this;
    loadOptions();
}

This ensures that if it's installed locally, the configuration won't conflict with other existing Qtractor installations.

Very useful for testing.

___

Conclusions:

Furthermore, these two requirements make it easier to create a portable Qtractor with your own plugins and samples.

You only need to:
1- Compile on Ubuntu 20 LT and add library dependencies to the lib directory.

2. Create an application run that saves the application's root path state and updates this path in the internal configuration files if it changes, and manages the lib environment variable.

The result is much cleaner than the current AppImage, more understandable, and with fewer files. It's a portable application in traditional style.

P.S.:
I used deploy to gather the libraries.
https://github.com/linuxdeploy/linuxdeploy/

Calf Suite works correctly (I still don't understand why it doesn't work in the official AppImage).
Samplv1 also works, as it uses the RubberBand library from the portable version.