added a cursor for paintbucket: Cursor.PaintBucket.png added also to resources, to Pinta.Resources.csproj&makefile and to PaintBucketTool.cs
added a cursor for paintbucket:
Cursor.PaintBucket.png
added also to resources, to Pinta.Resources.csproj&makefile and to PaintBucketTool.cs

PintaProject/Pinta,Fenex/Pinta,Mailaender/Pinta,jakeclawson/Pinta,jakeclawson/Pinta,Mailaender/Pinta,Fenex/Pinta,PintaProject/Pinta,PintaProject/Pinta