ESP32-POE-ISO-EA project box

This remake is to allow using an external antenna.

Changes:

• Added a hole for the antenna
• Moved the flap thing about 2mm towards the Ethernet port and made it more robust
• I removed the hole near the Ethernet port (I'm using POE)
• Added more vents
• Added a tiny pry slot thing to, hopefully, be able to open the case more easily

One missing thing is having an indent of the antenna's hex form to prevent it from rotating.