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This is an old question, and the accepted answer is still a good one. But there are more options now.
Among these is CotEditor, which meets OP's requirements (all of them!) but also exceeds them for users who would like to personalize their editing environment just a little more than TextEdit allows for.
That's the editor as set up according to OP's wishes, ...
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Focus stacker available at the Apple app store works well and has a one off purchase cost which is very reasonable. I have stacked in excess of 100 files, but for much larger stacks I use blocking, that is stacking about 100 files at a time then stacking theses stacks. I run this on a 10yr. old iMac running High Sierra it's slow but it works. You just have ...
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