RFE: Flatten the namespace package in the source code, somehow

[Zach Pearson]

For much the same reasons as #6917, where I said

"Having different names for source folders vs. installed folders breaks most modern programming tooling, which expects a 1:1 correspondence between the source module name and the installed module name. It's a little sand in the gears, breaking among other things IDEs, linters, and automated testers."

It would be good to flatten the namespace package in the source code and have a conversation about

• Whether apps and examples should move up or core should move down to bundles (Greg said during the meeting he prefers the latter, I'm OK with that)
• Whether that would means 'bundles' should be renamed to 'python' (I personally prefer 'chimerax')
• Whether core code should be in the top-level namespace
• Whether any code should be in the top-level namespace

[Zach Pearson]

Moved core down to bundles.