Fix tc conn to new block not changing sync channel

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My solution:

• Every non-dataset block is created with an empty synchronized_channel field. This makes the channel color for the block initially be black. The first time a connection is made to the block, the block is assigned that connection's channel.

Also, blocks are now created by 1 input (if normal block or analyzer) and 1 output (if normal block or dataset). This should help alot with quickly stringing together stuff.

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