v0.1.0-alpha.2

New features:

• Tabs can move freely around to any tab group just by clicking and dragging.
• HDRI skyboxes are fully implemented
• Cubemap textures with multiple sampling styles
• Better texture system management
• Texture loading progress
• Max texture mipmaps implemented
• Ability to reload all textures (Edit --> Reload Textures)
• FIXED: Sliders not sliding