Add subclass name to variables.
Sync gamma output with view settings value.
Fix bug introduced on last commit for an error typo.
Create new file render layer panel.
Move code for render layers from render panels to new panel.
Add new property for 'apply gamma input' option.
Normalize class names using 'Camel case' style.
Move layers code to new file.
Add new import for layer panels.
Delete unused code.
Start update new UI style for World panels.
Add small test for use 'ibl' files.