fix: standardize line endings

[rasa]

The command

find -type f -name 'gitignore' | xargs -n 1 dos2unix -i | sort | grep -vE '^\s*0'

returns:

       1       0       0  no_bom    text    ./templates/Mill.gitignore
       1      25       1  no_bom    text    ./templates/macOS.gitignore
       2       0       0  no_bom    text    ./templates/NotepadPP.gitignore
       2       0       0  no_bom    text    ./templates/Tye.gitignore
       2       0       0  no_bom    text    ./templates/Typings.gitignore
       4       0       0  no_bom    text    ./templates/SourcePawn.gitignore
       4       1       0  no_bom    text    ./templates/FuseTools.gitignore
      48       0       0  no_bom    text    ./templates/mule.gitignore
       7       0       0  no_bom    text    ./templates/DotnetCore.gitignore

Here's a key to the above:

column description
     1 number of DOS line breaks
     2 number of Unix line breaks
     3 number of Mac line breaks
     4. byte order mark
     5. text or binary
     6. file name

For all the files but macOS.gitignore, this PR replaced all the DOS line breaks with Unix line breaks.

Editorconfig complains about files that have both DOS and Unix line endings.

macOS.gitignore was left alone.

• [X] Template - Update existing .gitignore template