Allow longer scripts

[frankracis]

The 128 byte packet size isn't enough to handle some event scripts for the WT CJ4, possibly others. For instance, pressing the BARO knob runs the script:

(L:XMLVAR_Baro1_ForcedToSTD) ! (>L:XMLVAR_Baro1_ForcedToSTD) 
(L:XMLVAR_Baro1_ForcedToSTD) if{ 
      (A:KOHLSMAN SETTING MB:1, mbars) 16 * (>L:XMLVAR_Baro1_SavedPressure) 
      1 (>K:BAROMETRIC_STD_PRESSURE) 
} els{ 
      1 (L:XMLVAR_Baro1_SavedPressure) (>K:2:KOHLSMAN_SET)
}

The quickest solution would be to just increase kPacketDataSize to 256 or 512. (This example was actually 257 characters)

[theomessin]

Hi @frankracis, yes, the plan was to increase the PacketDataSize eventually. There's probably something to be said about minifying RNP code before sending it through. There's more research to be done on what the most efficient solution is (see #10). Feel free to submit a pull request.