transport: get rid of the TransportFactoryId abstraction and the associated registry #278
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TransportFactoryId was used to encapsulate a "name" and a unique identifier for each transport type, from which we had two:
Since the switching between transports will only happen a couple of times within the lifetime of a connection, we don't need to optimize the lookup of the required transport to switch to.
This patch simply changes the TransportFactoryId with a string and the lookup by ID to a lookup by string. The string identifiers are encapsulated in macros, so misspelling on the call sites is not likely. And we only have one single call site.
By removing the TransportFactoryId and TransportFactoryRegistry I can easily get rid off 400 lines of complex, difficult to read code.