Resolves #67 by changing Servo constructors and adding destructors

[fwacer]

Resolves #67 by changing Servo constructors and adding destructors. The constructor looks for an unused Servo to re-use first, before adding onto the end of the array.

So far this is untested on hardware.

I'm a little uncertain that changing "ServoCount" to "MAX_SERVOS" in the following lines is ok. As far as I can tell, it's just trying to keep the code from operating out of bounds on the servo array.

Servo/src/avr/Servo.cpp

Line 62 in 9fe7546

if( SERVO_INDEX(timer,Channel[timer]) < ServoCount && Channel[timer] < SERVOS_PER_TIMER) {

Servo/src/avr/Servo.cpp

Line 57 in 9fe7546

if( SERVO_INDEX(timer,Channel[timer]) < ServoCount && SERVO(timer,Channel[timer]).Pin.isActive == true )

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Memory usage change @ 987fb8f

Board	flash	%	RAM for global variables	%
arduino:mbed_nano:nano33ble	🔺 +264 - +272	+0.03 - +0.03	💚 -8 - 0	-0.0 - 0.0
arduino:mbed_nano:nanorp2040connect	🔺 +270 - +270	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m7:target_core=cm4	N/A	N/A	N/A	N/A
arduino:mbed_portenta:envie_m7	N/A	N/A	N/A	N/A

Click for full report table

Board	examples/Knob flash	%	examples/Knob RAM for global variables	%	examples/Sweep flash	%	examples/Sweep RAM for global variables	%
arduino:mbed_nano:nano33ble	272	0.03	-8	-0.0	264	0.03	0	0.0
arduino:mbed_nano:nanorp2040connect	270	0.0	0	0.0	270	0.0	0	0.0
arduino:mbed_portenta:envie_m7:target_core=cm4	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
arduino:mbed_portenta:envie_m7	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A

Click for full report CSV

Board,examples/Knob<br>flash,%,examples/Knob<br>RAM for global variables,%,examples/Sweep<br>flash,%,examples/Sweep<br>RAM for global variables,%
arduino:mbed_nano:nano33ble,272,0.03,-8,-0.0,264,0.03,0,0.0
arduino:mbed_nano:nanorp2040connect,270,0.0,0,0.0,270,0.0,0,0.0
arduino:mbed_portenta:envie_m7:target_core=cm4,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A
arduino:mbed_portenta:envie_m7,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A