[EM] = Electronic Modelling

So, probably 2 hours after deciding that it's probably time to start working on the PCB, I've got my first symbol.

Some things I've learned:

• While asked many times on the forum, the Fusion 360 team has no desire to implement KiCAD library imports.
  • Apparently, this is something holding back users that want to create custom keyboards.
    • Speaking of custom keyboards, I looked online for a split keyboard (to compare with the Lets Split I built for £81 and barely used) and everything is usually bland-looking and either large (because of the numpad), over £100 or both.
    • I guess this half explains why I've got to invent a brand new input device here, despite engineers around the world with better credentials and surely working on more complex problems seemingly content with being landlocked to a desk, potentially with some pay2play tweaks (as seen on r/mk or r/ergomk). It seems that there's just not many companies in this input device business, and innovation from established players seems to be non-existent.
• There are keyboard shortcuts for adding a pin and naming it.
• There's a "Pin Array" which basically makes this entire IC symbol for you, and I didn't know about it until I was like 2/3rds into creation. 
• There's some mysterious list of "Pin Directions" (see my mention of the "Change" command) and I can't find any docs on the ones that are Fusion360 exclusives (aka didn't feature in EAGLE).

• There's a "Change" comand that means that I can select what I want to change in a menu, then click on the pin I want changed.
  • For example, instead of right clicking each individual pin and then clicking properties and then clicking Pin Direction and then changing "io" to "in" (because that's what I did), I can just set up the Change function and then quickly click the pins I want to change.

Things to mention:

• I assume I can treat the components library similar to how I create a BOM folder for normal modelling.

• Next steps are to create and connect the footprint and 3D model.
• I couldn't really find any specific IC symbol layout guide to conform to, so I just tried grouping similar pins together and I think what I've created looks easy on the eyes.
• Creating this custom component first is like a low level mob fight before I go to the high level boss: the custom-footprint ESP32-S3-MINI-1U. 
  • (custom as in it's not a regular package like QFNXX that can be auto generated by Fusion, as well as having the most pins out of all components)