Faster, PinSAFE and ARM like DUE support

[Jeroi]

Added:

• isTouching() function atlast to the lib
• Internal cleanPins() function which is drived now every function that alters pins and there for now TouchScreen is pinsafe library atlast and supports LCD in same pins out of box.
• ARM support. Handling of commands with digitalWrite's instead of port handling

Speedup:

• Created private port, mask variables and moved their intializing to object creating functions. Now they use prosessor speed only when object is initialized, not every time when point is readed.
• Every write command are now direct port operations instead of digitalWrites.

Fixes:

• Library generally affected LCD pins everywhere. Because of this added internal cleanPins() funtion which is driven where needed in the lib.
• function pressure() was most badly affecting LCD pins, the cleanup code made it pinsafe and thus for were able to write simple isTouching() function without any cleanups.
• redefined int's and function definatios to more platform free int16_t's or uint16_t's