Consistent text file formatting in this code base

[bignose-debian]

The code base would benefit from consistent text file formatting:

• Line break style (LF)
• No trailing white space
• U+0020 SPACE for indentation
• etc.

These are fundamental text style settings that can be made explicit with an EditorConfig settings file, and altering each existing file to conform to that.

[bignose-debian]

The changes in branch wip/issue/139/editorconfig of my personal fork repository, address this issue.

(GitHub has instructions for how to collaborate with a remote repository.)

The branch merges cleanly to 'master' at the time of writing this.