libticables & libticalcs: add events system ?

[debrouxl]

Wild idea: firing typed events with parameters into callbacks when performing operations such as:

• selecting calculator + cable;
• switching communication protocol;
• going to send a virtual packet / have received a full virtual packet;
• going to send a raw packet / have sent a raw packet;
• going to attempt receipt of a raw packet / have received a raw packet;
• going to send a reset / sent a reset.

This will give better insight into the libraries' operation, for debugging purposes as well as packet dissection / manipulation (issue #12 - the event system imagined here could be used to implement it).

[debrouxl]

This was largely implemented a while ago, the code lives on the experimental2 branch.

[debrouxl]

The code now lives on the main branch.