Dart Zone Vector Pro 2-stage trigger / delete

A drop-in replacement for the rev trigger, which adds 2-stage trigger feature to your vecto pro.

Two versions available:

- Dual-purpose: Add a 2-stage trigger feature while keeping the rev trigger.

- Rev trigger delete: Add a 2-stage trigger feature while deleting the rev trigger.

Remarks:

This blaster takes at least 0.5 sec to rev up (even with 120C 3S lipo). You don't want to pull the trigger all the way; the first shot would be very weak. You should pause for a split second at the halfway instead of pulling it all the way. I added a tactile bump at the rev-trigger point in order to have more control with this.