Assumption of DPTs from HomeKit Types wrong

[snowdd1]

(Finding in #77 )

HomeKit uses two separated fields for Format and Unit which are mixed up in homebridge-knx in characteristic.js Line ~ 234

Format	Unit	DPT
BOOL	none	DPT1
INT	none	DPT5
INT	PERCENTAGE	DPT5.001
FLOAT	none	DPT9
FLOAT	PERCENTAGE	DPT5.001
FLOAT	else	DPT9

other types to come, not yet supported.

Citations from https://github.com/KhaosT/HAP-NodeJS/blob/master/lib/Characteristic.js :

62 Characteristic.Formats = { 
63   BOOL: 'bool', 
64   INT: 'int', 
65   FLOAT: 'float', 
66   STRING: 'string', 
67   ARRAY: 'array', // unconfirmed 
68   DICTIONARY: 'dictionary', // unconfirmed 
69   UINT8: 'uint8', 
70   UINT16: 'uint16', 
71   UINT32: 'uint32', 
72   UINT64: 'uint64', 
73   DATA: 'data', // unconfirmed 
74   TLV8: 'tlv8' 
75 } 

78 Characteristic.Units = { 
79   // HomeKit only defines Celsius, for Fahrenheit, it requires iOS app to do the conversion. 
80   CELSIUS: 'celsius', 
81   PERCENTAGE: 'percentage', 
82   ARC_DEGREE: 'arcdegrees', 
83   LUX: 'lux', 
84   SECONDS: 'seconds' 
85 }