Add a global config scope to set basic things that apply to all cogs of all types
#511
+37
−7
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Some config parameters, like 'exit on error', 'async' and 'working directory', are generally applicable to all/most cogs.
It makes sense to have a consistent definition for their setter/getter methods.
Many of these definitions exist on the Cog::Config base class, but user still need to specify them multiple times for each cog type.
Now you can set some options globally using a single block