Blender Git Loki

GPencil RNA: Set pressure and strength to 1.0 by default for new stroke points added via stroke.points.add()

This commit adds optional "pressure" and "strength" arguments to the
stroke.points.add() method. These are given default values of 1.0,
so that old scripts can be ported over to the new API with less effort
while reducing confusion about why auto generated strokes won't appear.