Add unsigned long support; addresses issues #39

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Memory usage change @ e8f2289a75a0b90ce31cfde658ff457ca15082c6

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	:small_red_triangle: 0 - +454	0.0 - +1.58	:small_red_triangle: 0 - +8	0.0 - +0.31
arduino:avr:mega	:small_red_triangle: 0 - +456	0.0 - +0.18	:small_red_triangle: 0 - +10	0.0 - +0.12
arduino:avr:nano	:small_red_triangle: 0 - +456	0.0 - +1.48	:small_red_triangle: 0 - +10	0.0 - +0.49
arduino:avr:yun	:small_red_triangle: 0 - +454	0.0 - +1.58	:small_red_triangle: 0 - +8	0.0 - +0.31
arduino:mbed_edge:edge_control	:small_red_triangle: 0 - +5464	0.0 - +0.56	0 - 0	0.0 - 0.0
arduino:mbed_nano:nano33ble	:small_red_triangle: 0 - +5456	0.0 - +0.56	0 - 0	0.0 - 0.0
arduino:mbed_nano:nanorp2040connect	:small_red_triangle: 0 - +431	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m4	:small_red_triangle: 0 - +3856	0.0 - +0.37	0 - 0	0.0 - 0.0
arduino:mbed_portenta:envie_m7	:small_red_triangle: 0 - +3848	0.0 - +0.49	0 - 0	0.0 - 0.0
arduino:megaavr:nona4809	:small_red_triangle: 0 - +455	0.0 - +0.93	0 - 0	0.0 - 0.0
arduino:megaavr:uno2018	:small_red_triangle: 0 - +455	0.0 - +0.94	0 - 0	0.0 - 0.0
arduino:sam:arduino_due_x_dbg	:small_red_triangle: 0 - +7040	0.0 - +1.34	N/A	N/A
arduino:samd:arduino_zero_edbg	:small_red_triangle: 0 - +3308	0.0 - +1.26	0 - 0	0.0 - 0.0
arduino:samd:mkrzero	:small_red_triangle: 0 - +3308	0.0 - +1.26	0 - 0	0.0 - 0.0
arduino:samd:nano_33_iot	:small_red_triangle: 0 - +3308	0.0 - +1.26	0 - 0	0.0 - 0.0

Click for full report table

Board|examples/JSONArray
flash|%|examples/JSONArray
RAM for global variables|%|examples/JSONKitchenSink
flash|%|examples/JSONKitchenSink
RAM for global variables|%|examples/JSONObject
flash|%|examples/JSONObject
RAM for global variables|% -|-|-|-|-|-|-|-|-|-|-|-|- arduino:avr:leonardo|0|0.0|0|0.0|0|0.0|0|0.0|454|1.58|8|0.31 arduino:avr:mega|0|0.0|0|0.0|0|0.0|0|0.0|456|0.18|10|0.12 arduino:avr:nano|0|0.0|0|0.0|0|0.0|0|0.0|456|1.48|10|0.49 arduino:avr:yun|0|0.0|0|0.0|0|0.0|0|0.0|454|1.58|8|0.31 arduino:mbed_edge:edge_control|0|0.0|0|0.0|0|0.0|0|0.0|5464|0.56|0|0.0 arduino:mbed_nano:nano33ble|0|0.0|0|0.0|0|0.0|0|0.0|5456|0.56|0|0.0 arduino:mbed_nano:nanorp2040connect|0|0.0|0|0.0|0|0.0|0|0.0|431|0.0|0|0.0 arduino:mbed_portenta:envie_m4|0|0.0|0|0.0|0|0.0|0|0.0|3856|0.37|0|0.0 arduino:mbed_portenta:envie_m7|0|0.0|0|0.0|0|0.0|0|0.0|3848|0.49|0|0.0 arduino:megaavr:nona4809|0|0.0|0|0.0|0|0.0|0|0.0|455|0.93|0|0.0 arduino:megaavr:uno2018|0|0.0|0|0.0|0|0.0|0|0.0|455|0.94|0|0.0 arduino:sam:arduino_due_x_dbg|0|0.0|N/A|N/A|0|0.0|N/A|N/A|7040|1.34|N/A|N/A arduino:samd:arduino_zero_edbg|0|0.0|0|0.0|0|0.0|0|0.0|3308|1.26|0|0.0 arduino:samd:mkrzero|0|0.0|0|0.0|0|0.0|0|0.0|3308|1.26|0|0.0 arduino:samd:nano_33_iot|0|0.0|0|0.0|0|0.0|0|0.0|3308|1.26|0|0.0

Click for full report CSV

``` Board,examples/JSONArray
flash,%,examples/JSONArray
RAM for global variables,%,examples/JSONKitchenSink
flash,%,examples/JSONKitchenSink
RAM for global variables,%,examples/JSONObject
flash,%,examples/JSONObject
RAM for global variables,% arduino:avr:leonardo,0,0.0,0,0.0,0,0.0,0,0.0,454,1.58,8,0.31 arduino:avr:mega,0,0.0,0,0.0,0,0.0,0,0.0,456,0.18,10,0.12 arduino:avr:nano,0,0.0,0,0.0,0,0.0,0,0.0,456,1.48,10,0.49 arduino:avr:yun,0,0.0,0,0.0,0,0.0,0,0.0,454,1.58,8,0.31 arduino:mbed_edge:edge_control,0,0.0,0,0.0,0,0.0,0,0.0,5464,0.56,0,0.0 arduino:mbed_nano:nano33ble,0,0.0,0,0.0,0,0.0,0,0.0,5456,0.56,0,0.0 arduino:mbed_nano:nanorp2040connect,0,0.0,0,0.0,0,0.0,0,0.0,431,0.0,0,0.0 arduino:mbed_portenta:envie_m4,0,0.0,0,0.0,0,0.0,0,0.0,3856,0.37,0,0.0 arduino:mbed_portenta:envie_m7,0,0.0,0,0.0,0,0.0,0,0.0,3848,0.49,0,0.0 arduino:megaavr:nona4809,0,0.0,0,0.0,0,0.0,0,0.0,455,0.93,0,0.0 arduino:megaavr:uno2018,0,0.0,0,0.0,0,0.0,0,0.0,455,0.94,0,0.0 arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A,0,0.0,N/A,N/A,7040,1.34,N/A,N/A arduino:samd:arduino_zero_edbg,0,0.0,0,0.0,0,0.0,0,0.0,3308,1.26,0,0.0 arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0,3308,1.26,0,0.0 arduino:samd:nano_33_iot,0,0.0,0,0.0,0,0.0,0,0.0,3308,1.26,0,0.0 ```