Provide basic features for working in the Advanced Editor in dataflows - e.g. search, replace, intel

[Steve-DataCoura]

Please recognize that developers actually use the Advanced Editor in dataflows to modify the M-Code and provide at least BASIC support features for this.

- Find, Replace, Replace All

- Intellisense

And break up the script into multilple lines adding a step using the UI.  

 This format is very difficult to read:

  #"Merged queries" = Table.NestedJoin(#"Renamed columns", {"Company", "Customer No"}, #"Renamed columns", {"Company", "Customer No"}, "Renamed columns", JoinKind.LeftOuter)

 This is better-

   #"Merged queries" = Table.NestedJoin(#"Renamed columns",

      {"Company", "Customer No"}, #"Renamed columns",

      {"Company", "Customer No"}, "Renamed columns",

          JoinKind.LeftOuter)

People may have different opinions about where to add the line breaks in the code - but I guarantee you that if you asked 10 M-code designers, none of them would think that putting everthing in a single line is the best option.