message: Fix brush colors in pixel history view
  The shader output brush colors were displaying the tex before color
  instead of the shader output color. Updated the linear -> sRGB formula
  to match what DirectX does.
diff: @@ -320,9 +320,16 @@ public:
  if(col == 2)
  {
  if(isEvent(index))
  + {
  return backgroundBrush(getMods(index).first().preMod);
  + }
  else
  - return backgroundBrush(getMod(index).preMod);
  + {
  + const PixelModification &mod = getMod(index);
  + if(mod.directShaderWrite)
  + return backgroundBrush(mod.preMod);
  + return backgroundBrush(mod.shaderOut);
  + }
  }
  else if(col == 4)
  {
  @@ -476,13 +483,16 @@ private:
  if(m_IsDepth)
  r = g = b = qBound(0.0f, (val.depth - m_Display.rangeMin) / rangesize, 1.0f);
  + // Convert from linear color to sRGB
  {
  - r = (float)powf(r, 1.0f / 2.2f);
  - g = (float)powf(g, 1.0f / 2.2f);
  - b = (float)powf(b, 1.0f / 2.2f);
  + r = (r <= 0.0031308f) ? r * 12.92f : 1.055f * (float)powf(r, 1.0f / 2.4f) - 0.055f;
  + g = (g <= 0.0031308f) ? g * 12.92f : 1.055f * (float)powf(g, 1.0f / 2.4f) - 0.055f;
  + b = (b <= 0.0031308f) ? b * 12.92f : 1.055f * (float)powf(b, 1.0f / 2.4f) - 0.055f;
  }
  - return QBrush(QColor::fromRgb((int)(255.0f * r), (int)(255.0f * g), (int)(255.0f * b)));
  + // Round to nearest value in [0,255]
  + return QBrush(QColor::fromRgb((int)(255.0f * r + 0.5f), (int)(255.0f * g + 0.5f),
  + (int)(255.0f * b + 0.5f)));
  }
  QString modString(const ModificationValue &val, int forceComps = 0) const
  