Support for custom <RS> and <GS> encodings

[bobek]

I guess, this is an annoyingly frequent issue with cheap (Aliexpress sourced) barcode scanners. Mine correctly reads DataMatrix but sends and as ANSI escape control sequences of and keys (looks quite random).

When testing on the codes generated with Binner separators are not correctly detected:

{
  "type": "datamatrix",
  "labelType": "Unknown",
  "vendor": "Binner",
  "value": {
    "supplierId": "01BS8P7XSDGXM-BNKSP44BLB1B2"
  },
  "correctedValue": "[)>␞09␝V01BS8P7XSDGXM-BNKSP44BLB1B2\r\r\r␄\r",
  "rawValue": "[)>9BV01BS8P7XSDGXM-BNKSP44BLB1B2\r\r\r",
  "length": 36,
  "rsDetected": false,
  "gsDetected": false,
  "eotDetected": false,
  "invalidBarcodeDetected": false,
  "rawValueFormatted": "[)>9BV01BS8P7XSDGXM-BNKSP44BLB1B2␍␍␍"
}

It should be decoded as [)><RS>9<GS>BV01<GS>BS8P7XSDGXM-<GS>BNKSP44<GS>BL<GS>B1<GS>B2<GS><CR><EOT><CR>. Scanner sends the following sequence:

00000000  5b 29 3e 1b 5b 32 30 7e  39 1b 5b 31 39 7e 42 56  |[)>.[20~9.[19~BV|
00000010  30 31 1b 5b 31 39 7e 42  53 38 50 37 58 53 44 47  |01.[19~BS8P7XSDG|
00000020  58 4d 2d 1b 5b 31 39 7e  42 4e 4b 53 50 34 34 1b  |XM-.[19~BNKSP44.|
00000030  5b 31 39 7e 42 4c 1b 5b  31 39 7e 42 31 1b 5b 31  |[19~BL.[19~B1.[1|
00000040  39 7e 42 32 1b 5b 31 39  7e 0a 0a 0a              |9~B2.[19~...|

is encoded as ESC[19~ and as ESC[20~. It would be really awesome to have a configuration values for setting custom GS/RS sequences, which would be used by something around normalizeControlCharacters().

WDYT?