Update version 1.0.7 — icpaint Steam update #4678525

Older versions of gif files (GIF87a) and gif files without a "Global Color Table" could not be opened, but these gif files can now be opened. Added "Blending mode" to how to paint with the "Curve brush" tool. Added "Pixel pen" mode to "Curve Brush" tool. Enabled to scale the brush stroke with Ctrl + Alt click when manipulating control points with the "Curve brush" tool. Enabled to change the pen pressure of control points by Ctrl + Shift dragging with the "Curve brush" tool. Enabled to move multiple control points at the same time by Shift-clicking with the "Curve brush" tool. Enabled to adjust the size of the circle when there is no control point in the circle when moving multiple control points at the same time by Shift-clicking. Added a mouse cursor (image) that appears when moving a curve with Ctrl + Shift drag. Reduced drawing delay by increasing the drawing update frequency when ad...