1.15.3 live on Beta branch

• Add an option to export the project as a portable zip file.
  • All attached files will be copied to the project `src/`subfolder
  • File reference is converted to a relative path.

• Add preference option to clear temp folder on close program.
  

Interface

• Increase coverage of localizable texts.
• [Notification] Shell execution now shows up in the notification.
• [Inspector] Range value shows only one textbox when the value is linked.
• [Preview] Grid now uses vec2 for width and height.
• [Code editor] Autocomplete can now be applied with enter key and mouse click.

Node

• Add support for custom nodes.
• New interpret number node for converting an array of numbers into surface.
• New execute shell node.
• Related node suggestion now defined externally with .json file and can be extended by adding a new file in `localappdata/PixelComposer/Nodes/Related`
• Rename "node" category to "misc"
• [Image GIF] Add option to output as array.
• [Image Array] Now reuse the surface in each frame instead of re-creating a new one.
• [L System] Add random seed property.
• [L System] Improve generation performance.
• [L System] Add max rule length limit as an attribute.
• [L System] Add a warning when the generated rule is longer than the limit.
• [Export] Add zero padding for the array index.
• [Particle, VFX] Animation speed, gravity, and wiggle can now be random range.
• [Particle, VFX] Add bounce ground friction property.
• [Fluid > Add Fluid] Add velocity-related properties.

Bug

• Fix project always prompt save dialog.
• [Globalvar] Fix slider ignoring range and step value.
• [Globalvar] Fix error on vec2 range datatype.
• [Preview] Fix the right and bottom-most grid lines not rendering.
• [Graph] Fix crashes when dropping a file from asset to image node.
• [Graph Node Export] Fix error on open.
• [Processing nodes] Fix static node flush the output surface every frame.
• [Particle, VFX] Nodes now keep a cache of all active particle surfaces to prevent particle flashing due to flushed surface.
• [Particle, VFX] Fix array surface causes the particle to not render.
• [Export] Fix preview extension does not reflect the selected extension.
• [Scatter] Fix error when using "direct data" distribution mode.