New long-press detection on buttons

new LongPressDetector class

• new class added, it is not real button, it is observer to other buttons
• added a variant of LongPress example that demonstrates easy use of new LongPressDetector class

fixed lastChange() behaviour

• method was not implemented in derived classes, so it returned values from the base class and did not reflect different behaviour of derived ones

New auto-repeat button

new AutoRepeatButton class

• new class for auto-repeat button
• added a variant of UpDown example that shows the simplicity of using AutoRepeatButton

changed dbTime datatype

• the dbTime datatype was changed from uint32_t to uint16_t in constructor declaration to make the datatypes of method params consistent

Saving per-object's memory

per-object memory was reduced to 10 bytes from original amount of 24 bytes for JC_Button class.

changes to reduce memory consumption per object when the class is instantialized

• debounce time limited to 16-bits and 60.000 msec
• m_time member removed. it stored "actual" time, replaced with millis() where necessary
• packed boolean class members to 1-bit values
• polished param names and types

New robust debouncing algorithm

debouncing algorithm replaced with a robust one

• the original algorithm was as simple as possible: after detecting a change, wait for a defined period of time, then read input again and that is a new stable state.
• the new algoritm checks the input in each loop and monitors how long it has been stable. If the stable period is longer than the defined time, then a new stable state is reported. No other changes in functionality, just the debouncing algorithm.
• object's memory reduced by 2 bytes

m_changed member removed

• m_changed was replaced with an expression lastState!=currentState
• new method changed() added

Initial release of forked lib

This is the initial release right after the lib fork with just minimal changes applied.

• just renaming, changed links and modified descriptions