Potentially rename some of the crates for clarity

[afranchuk]

I think some of the crates in the project could have better names, especially since #816 will be adding another crate. Changing crate names causes confusion for current consumers, however keeping poor names can cause confusion for future consumers: either decision has a downside.

This is my proposal (as if #816 occurred, anything omitted stays the same):

crate	new name	reasoning
minidump-processor (non-stackwalk logic)	minidump-processor	encompasses all the extra things this does
minidump-processor (stackwalk logic)	minidump-stackwalk	it's the stackwalk function
minidump-stackwalk	minidump-analyzer	it does much more than just stack walking

The mozilla minidump-analyzer crate (not in this project) could have another more specific name, like minidump-stack-info.

[gabrielesvelto]

Now that I've cut a new release I think we can proceed with this. We might aim for a 1.0.0 release which will break some things WRT the current setup but will also guarantee future stability. One thing I'd like to do first is figure out who are our non-Mozilla downstream users and how this would affect them (if at all).

[afranchuk]

Using the public information on crates.io, the external consumers look to be:
https://crates.io/crates/witchcraft-server
https://crates.io/crates/udbg
https://crates.io/crates/minidumper
https://crates.io/crates/minidump-debugger (assuming this doesn't fall into the "Mozilla" category)