Fixes for Wire lib, HardwareSerial, typos and other bugs
- Changed the Wire Lib - use HW FIFO - incresed buffer size - renamed struct variable
- Fixed a typo: == / =
- Updated the boards.txt
- Increased the stack size for XMC1100
- Fixed the HardwareSerial issue from GitHub
- Adjusted the delayMicroseconds() function
- Added the XMC1300 Board