New CI build scripts for flexible directory strucutre

[stephenhensley]

We're planning on using more directories to better organize the existing (and future) examples provided in the repo.

The root level of the repo isn't planned to change too much, but a bunch of the library, and utility folders are filtered out of the compile-search in the new script.

Functionally, the new build_examples.py works the same as the build_examples.sh it is replacing, but it will support examples nested in other directories (i.e. seed/dsp/*, etc.).

This will be necessary for supporting new structures like requested in #239

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The new build examples script has been tested to work with the existing structure and tested for recursive path-searching.

The build_dist.py script still needs to be updated to properly remap the "platform" to be a combo of folders (i.e. seed/dsp will end up showing up in the web programmer as "seed_dsp" under platform).

While making a few changes I'd also like to address #129 since it's very old, and causes annoying merge conflicts for pretty much no reason.

[stephenhensley]

Looks like everything (including the nested-folder stuff) is working correctly (patch_sm_GettingStarted bins are in place).

I'm not going to merge it now incase it breaks the web-programmer over night, but it should be good to go.