Transform controls and material layer enhancements

This update improves transform controls and introduces new material layers, enhancing the overall user experience.

Changes

• Transform controls now work with multiple selected objects.
• New Lines material layer.
• New Points material layer.
• New renamer for multiple selected layers.
• New camera quick switcher (to move to different planes like Front, Back, Left, Right).
• New login/register view (will allow us to do much more in future).
• Frame object was removed (doesn't make much sense in 3D).
• Context menu now shows how many selected objects are.
• Objects panel is now resizable.
• Improvements in grouping and object panel layers.
• Now it is possible to select, drag, group multiple objects from the object panel.
• New global setting to toggle snapping.
• Improved snapping system.
• Fixes in resize handlers.
• Fixes in the camera behavior.
• Fixes in texture handling.
• Fixes in materials.