added TPKeyboardAvoidingAdditionsOptions protocol #210
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to allow for views to override specific pieces of functionality as needed
added TPKeyboardAvoiding_idealOffsetForViewAlwaysTop to allow views to be able to float to the top instead of middle
use case: have an 'autocomplete' style dropdown for one of my textfields. Need as much room as possible between the field and the keyboard, this will (safely) alter the math in calculating the scroll position so the textfield can specify that it needs to be on the top instead of the middle