PT2260/SC2260 support (tested on 433MHz)

i.e.:
Decimal: 4685616 (24Bit) Binary: 010001110111111100110000 Tri-State: F0F1F1110100 PulseLength: 146 microseconds Protocol: 1
Raw data: 4548,224,372,520,60,216,404,184,400,192,396,492,92,484,120,468,132,148,460,444,136,456,132,460,140,448,144,444,152,440,152,440,160,120,484,112,472,428,152,440,156,124,480,116,472,124,468,132,452,
Decimal: 4685571 (24Bit) Binary: 010001110111111100000011 Tri-State: F0F1F1110001 PulseLength: 149 microseconds Protocol: 1
Raw data: 4612,164,432,476,120,148,460,132,460,136,460,456,136,448,156,436,172,92,508,420,172,420,180,416,184,412,180,412,192,404,192,408,196,68,536,60,528,76,516,84,508,92,500,100,488,432,164,424,176,

RCSwitch.cpp

@@ -91,7 +91,7 @@ unsigned int RCSwitch::nReceivedBitlength = 0;
 unsigned int RCSwitch::nReceivedDelay = 0;
 unsigned int RCSwitch::nReceivedProtocol = 0;
 int RCSwitch::nReceiveTolerance = 60;
-const unsigned int RCSwitch::nSeparationLimit = 4600;
+const unsigned int RCSwitch::nSeparationLimit = 4300;
 // separationLimit: minimum microseconds between received codes, closer codes are ignored.
 // according to discussion on issue #14 it might be more suitable to set the separation
 // limit to the same time as the 'low' part of the sync signal for the current protocol.