Added a solution for Dictionaries with nested objects

[Garfield1002]

A proposed solution for using dictionaries with nested objects

Corresponding issue: https://github.com/Synthoid/ExportSheetData/issues/151

Implemented solution

A new header type surrounded with [{}]. This will create a new object names after the cell content rather than the column title.

Usage

We can now address the issue raised in 151 with this new header

[{Class}]	[{Class}]PSIPL	[{Class}]SMCSLU
Class A	9	2
Class B	6	4
Class C	4	6
Class D	3	8
Class E	1	10

Outcome (All examples are done with only the Nested Elements options enabled):

{
  "Sheet1": {
    "Class A": {
      "PSIPL": 9,
      "SMCSLU": 2
    },
    "Class B": {
      "PSIPL": 6,
      "SMCSLU": 4
    },
    "Class C": {
      "PSIPL": 4,
      "SMCSLU": 6
    },
    "Class D": {
      "PSIPL": 3,
      "SMCSLU": 8
    },
    "Class E": {
      "PSIPL": 1,
      "SMCSLU": 10
    }
  }
}

Advantages

We can take this a step further and are able to rework the advanced country example to now include different objects as well as lists

[{Continents}]	[{Continents}][{Countries}]	[{Continents}][{Countries}][Cities]{#Name}	[{Continents}][{Countries}][Cities]Population
North America	Canada	Toronto	2615000
North America	Canada	Vancouver	603500
North America	Canada	Montreal	1650000
North America	United States	New York	8273000
North America	United States	Chicago	2697000
North America	United States	Los Angeles	3849000

Output

{
  "Sheet1": {
    "North America": {
      "Canada": {
        "Cities": [
          {
            "Name": "Toronto",
            "Population": 2615000
          },
          {
            "Name": "Vancouver",
            "Population": 603500
          },
          {
            "Name": "Montreal",
            "Population": 1650000
          }
        ]
      },
      "United States": {
        "Cities": [
          {
            "Name": "New York",
            "Population": 8273000
          },
          {
            "Name": "Chicago",
            "Population": 2697000
          },
          {
            "Name": "Los Angeles",
            "Population": 3849000
          }
        ]
      }
    }
  }
}

Code changes

• Added Dict to SubpathTypes and changed getSubpathTypeJson to accomodate this new header
• Changed getKeyPath and trimKeySubpath to accomodate for the 2 character identifier
• Changed exportSpreadsheetJson