Add handler_default_channels
configuration option
#454
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When configuring multiple handlers, one annoying problem I often come across is having to add every channel that is meant to be used with a specific handler to all handlers with an exclusive list, eg:
The idea behind this PR is to be able to set a list of default channels that is applied to all handlers.
If a handler has a list of its own and it's the same type as the default one (inclusive/exclusive) the two lists are merged. If the handler's list is a different type, it replaces the default one. Handlers without lists inherit the default one. A
use_default_channels
handler option was also added so that a certain handler can choose not to use the default list.