base nodes naming inconsistencies (aka placeholders and default values)

[witekw]

AS IS

• map variable

  • Id
  • Variable Name
  • Fields
    • possibility to add many fields
    • one field already added, with default values: varName, 'value'
    • when we click on "+" (add fields)
    • placeholder "Field name", empty input box to pass an expression

• spel variable

  • Id
  • Variable Name
  • Expression, default value: 'value'

• sql variable

  • Id
  • Variable Name
  • Expression, default value: SELECT * FROM input

• switch

  • Id
  • Expression, default value: true
  • exprValue, default value: output

TO BE

• less inital values, rather placeholders

• unified naming

• map variable

  • no initial values in Fields, just placeholders: key, 'value'

• spel variable

  • rename node to "variable" (we will allow different expression libraries?)
  • Variable Name placeholder: name
  • Expression placeholder: 'value'

• sql variable

  • Variable Name placeholder: name
  • Expression placeholder: SELECT * FROM input

• switch

  • exprVal -> Variable Name (as variable is available later on in the flow, not only in scope of switch and outgoing edges)
  • change placeholder value of Variable Name to name

• updated docs `