Correctly convert issue table cells to their display string

To display the data of the cells of the issue table, the raw value has to be converted to a human readable string.

In the current implementation, only the ID column is special cased.

Each column has a type: ColumnInfoDto.type. Depending on this type, the conversion to the display string has to be adapted.

• path: `filename.extension [C:/path/to/file/]` (Separator is always `/`)
• tags: elements of the tag list joined with `", "`
• number:
  •  null: empty string
  • string `Infinity`, `-Infinity, or `NaN`: could be displayed as is
  • If the number's fractional part is 0, render it as decimal integer, otherwise as decimal floating point value, preferable not in exponential notation
• boolean: ColumnInfoDto.typeOptions should be used. A value of false should take index 0, true index 1. ColumnTypeOptionDto.key is the string to show the user.
• state, string: just display them as they are (nulls are converted to an empty string)