v1.3.46

• Fixed errors checking for cgminer updates (due to their new 3.6.6-1 versioning pattern)
• Handle argument exceptions checking for cgminer and bfgminer updates by showing a notification
• Make checking for cgminer and bfgminer updates optional
• Make bfgminer the default mining engine for new users
• When upgrading a mining engine, don't stop mining if that engine isn't being used