Touch API

[alexandruCarp]

Made functions for single touch and gesture events, currently working on the multi touch ones.
Tested the example app on the stm32f412gdiscovery and it worked fine.
Fixes #15.

[alexandruCarp]

I had a problem with the board when trying to install the app.
I followed the instructions from here, but when running tockloader listen I was getting this error:

Initialization complete. Entering main loop
Error loading processes!
App memory does not match requested address Actual:0x20014000, Expected:0x20004000

I solved it by modifying this file (changed 0x20004000 with 0x20014000). Everything worked fine after this change, but is it the correct solution or should I have done something else?