Video textures and object panel improvements

This update introduces new features for video textures and enhances the object panel for better usability.

Changes

• Video textures now have player features (Play/Stop/Next/Back/Volume).
• New renamer panel allows the renaming of multiple objects at once.
• Objects panel (hierarchy panel) now correctly displays tree structures and supports multi-selection with Shift/Alt/CMD.
• Objects panel drag/drop was rebuilt and now allows proper parent/child relationships.
• Object grouping was improved (and issues fixed).
• Snapping with transform tools now considers the axis of the movement to prevent unneeded snapping.
• Added new shortcuts and fixed wrong shortcuts labels.
• Buttons without functionality removed until they work (aka. presentation mode).
• Minor UI improvements.
• Tutorial wording was improved.
• Fixed import on .spline files.
• Fixed exporting of HTML/JS files.
• Fixed issue with gradient layers.
• Fixed issue with clones when using the range sliders.
• Fixed issue with alignment component.
• Fixed issue with transform controls undo/history.
• Fixed issue with light objects icons.
• Fixed issue with text horizontal alignment.
• Fixed light spot intensity issue.