Store and manage user preferences

[kitswas]

Currently, all the application settings are hard-coded.

We need to let the user change them.

The QSettings Class can help us achieve this.

Mockups

The main window needs a preferences button.

The settings/preferences dialog box should look like

Behaviour

1. The settings should be stored in an ini file.
2. The settings must be loaded on the application launch.
3. On pressing OK in the Settings window, the old settings should be overwritten.
4. If the ini file is missing/not found, the default settings must be written to a file on app launch.
5. Individual settings should be grouped. e.g., Default Port under section Server, key mappings under section Keymap.

Checklist

• Create the UI. (Just the outline as shown in the mockup)
• Add logic to the UI elements
• Complete the individual sections

[kitswas]

Partially handled by #5.