NegPy 0.13.0

• Added D-Range Clip slider for controlling the bounds of normalization process.
• Added Sort Order settings for contact sheet UI section (sort by name or date, ascending/descending).
• Added HQ toggle for viewport preview (renders preview in full resolution).
• Improvements to histogram & photometric curve rendering.
• Overall performance & stability improvements.
• Make "Pick WB" tool more predictable by averaging 8x8 area instead of sampling simple pixel.
• Fix: Linux appimage crashing on some distros.
• Fix: Border added via export menu being picked up by histogram calculation.
• Fix: mouse wheel accidentally changing sliders and dropdowns when scrolling the sidebar.
• Fix: Crash when using the Clear button to remove all files from the session.