1.15.5 live on Beta branch

• Note that there's a new font definition "h2". Please update your localization file to include this to prevent rendering errors.
• Add support for .png palette.

Interface

• Add button in panel menu > workspace and hotkey (ctrl + f10) for resetting current UI layout.
• Add a preference setting to set UI panning button to mouse side button.
• [Animator] Rework the timeline system.
  • Folder
  • Color label
  • Go to button for property

• 
  [Graph] Node and properties can be recolored.
  
• 
  [Graph] Hold ctrl while dragging the output junction to disconnect multiple connections at once.
  
• 
  [Graph] Add the ability to copy/paste every property between nodes of the same type.
  
• 
  [Graph] Grid line now scales up based on line distance instead of the current zoom level.
  
• 
  [Graph] Add option to not render origin as think line.
  
• 
  [Graph] Add highlight every 10 grid lines.
  

Node

• [PCX] Add color creation functions:
  • `color_rgb` creates color from RGB value (0-255).
  • `color_hsv` create color from HSVvalue (0-255).
  • `color_hex` creates color from a hex string.

• 
  [Node Action] Add expression support.
  • Follow path action now comes with an expression for automating path progress.

• 
  [Node Action] Add id support for node, calling input by internal name.
  
• 
  [Node Action] Add isometric cube node action.
  
• 
  Add related nodes to group and loop groups.
  
• 
  [Number] New slider and rotator.
  
• 
  [Group input] Input ordering is now auto-resolved to prevent duplicate input order.
  
• 
  [Sprite stack] Add an option to stack each surface in an array into one image.
  
• 
  [Sprite stack] Add stack preview for combined type.
  
• 
  [Pixel Builder] Add group io nodes.
  

Bug

• [Number] Fix crash when casting value.
• [Number] Fix step property not working.
• [Number] Fix rotator not showing.
• [Wave Path] Fix error when the frequency is set to less than 1.
• [Canvas] Fix the error when deleting the last frame while previewing the last frame.
• [Loop, Feedback] Fix error on create.
• [HLSL] Fix crash on create.
• [Pack Sprite] Fix output returns an empty image.
• [Stream Workshop] Fix crash when updating workshop content.
• [Stream Workshop] Add option to set update note.
• [Collection] Add an option to change the thumbnail for local collection.
• Fix the error when pasting a node where it doesn't belong.