Issue #25 : Add option to lock Home screen

[Sinexo]

What is it?

• Bugfix
• Feature
• Codebase improvement

Description of the changes in your PR

• Updated Config
• Updated Constant
• Updated Mainactivity
• Updated SettingsActivity
• Updated activity_setting

Fixes the following issue(s)

• [Feature request] Add option to lock Home screen

Relies on the following changes

• Add option in the settings to lock the home screen, no app, pages or widget can be deleted/moved. App can still be unistalled from the app screen.

Acknowledgement

• I read the contribution guidelines.

[naveensingh]

I don't think this is the right way to do it. It works but it works a little bit too much. One can't 'Uninstall app' or view 'App info' because long press menu is completely disabled. Only actions that would directly affect the home screen layout should be hidden/disabled.

The preference name should be a little more descriptive like 'Lock home screen layout' or 'Lock layout' under the 'Home screen' section.

If you still want to work on this feature, please raise a new PR (after the initial release) taking into account the above suggestions. I'll be closing this one because soon there will be a lot of changes in the main branch thus too many conflicts to solve.