Added twi header and source files. Added register mapping in the header file.
Finished first API draft of TWI
Applied some changes according to the feedback from the architect manager
Added delay

The delay-function is currently in main.c, for testing purpose. Not sure how exact the delay is, has only tested with a timer and not an oscilloscope. But it seems accurate...
Merge branch 'mcu_timers_temp' into mcu_timers
Added more delays
Added end paranthesis
Currently only TC0 is working
Added changes to test_tc.c, to test TC1.

Assert tests are failing, except on conf_channel.
Removed code from main and reverted to working tests.

Delay-functions currently now in test_tc_man.txt and the assert tests now test TC0 again, which is working.
Changed tcclks in test_tc.c back to 1
Merge branch 'mcu_timers_temp' into mcu_timers

Conflicts:
	src/main.c
Added some functions in TWI c-file
First draft of twi.c
Finished writing twi_set_clocks function in twi.c file
Minor fixes to twi files
Minor fixes in twi.c
bla bla
Updated the tests on tc

Found out why TC1 and TC2 would not work. Activated wrong peripherals in PMC. Now the tests run tests on TC0, TC1 and TC2, all on channel 0. All is working.
All tests working on TC

The tests are running at TC0 - channel 0, TC1 - channel 1 and TC2 - channel 0. This is to test that all three base adresses and all the offsets are working even if it is a different channel.

Also the delays are working. One fast delay, one a bit slower and one really slow.