For T4.x to allow MTP USB type device to generate events to send to the host, the Endpoint configuration need to change to say that we are transmitting on interrupt, not receiving.

Plus I updated the end point event size to 32 as some events might be > 16.  16 is only large enought so send one parameter.  I noticed Kindle Fire has it set to something like 28...

I have done similar changes for T3.x but have not tested it yet.

allow multiple parameters for events

Needs accompanying changes in Arduino's boards.txt, enabling corresponding menu entries

https://forum.pjrc.com/threads/23681-Many-axis-joystick?p=41943&viewfull=1#post41943

This patch simply checks if NUM_ENDPOINTS is defined, and will bypass the
built-in USB descriptor, device and memory code, and allows a custom setting.
This bug does not affect the IDE unless someone adds the custom option to
the boards.txt file, and provides replacement code in a library or sketch.
It can also be used to turn off USB by providing no replacements, while
allowing speeds >= 20MHz.