Fix some spelling and grammar issues in README
Render linked EntityEntries stippled in EntityEntryViewer

+ Scale up entity coordinates 4x to match entry x/y/zoffset scale
Restore old EntityEntryViewer camera range
Don't redraw the same entityentry if it links to itself
Allow changing C2/C3 level box count
Use a sprite instead of glPoint in EntityEntryViewer

+ Add Resources.PointTexture
+ Separate sprite rendering code from RenderPickup