Converge on one concept and set of APIs for "stuff packed with dlls"

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**Issue moved from microsoft/dotnet#1278**
- Please respond to @atrauzzi.

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_From @atrauzzi on Friday, December 11, 2020 3:01:31 AM_

In the spirit of https://themesof.net/ it would be nice if the resource story in .net converged on one idea.

- I'm always unsure as to which is the right one to pick and official docs don't clearly spell out which to use.
- I'm not sure which APIs for accessing the embedded resources are the right to use or what kind of lifecycle and caveats I must observe

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An internet search will result in this question popping up over the years. [Here's one](https://stackoverflow.com/questions/1934826/whats-the-difference-between-a-resource-and-an-embedded-resource-in-a-c-sharp-a) and you can see that the answers have a difficult time being direct. Just references to MS docs which don't really offer clear direction.