Move stuff from types to auth

[sunnya97]

This PR looks likes there's a lot more changes than there actually are, because of having to rename the package name prefix across many many files.

The primary goal of this PR is I move the stuff that's specific to the auth anteHandler to the auth module rather than the types folder. This includes:

• StdTx (and its related stuff i.e. StdSignDoc, etc)
• StdFee
• StdSignature
• Account interface

Related to this organization, I also:

• Got rid of AccountMapper interface (in favor of the struct already in auth module)
• Removed the FeeHandler from the AnteHandler as discussed in process fees in endblock #1047
• Removed GetSignatures() from Tx interface (as different Tx styles might use something different than StdSignature)

• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGELOG.md

[rigelrozanski]

#1047 (comment)

[ebuchman]

Makes a lot of sense to me. I might even suggest to have a top level dir auth and to move x/auth to auth/std. If an alternative replay-protection + signing structure comes to bear, it could be auth/non-std or whatever ...

[ebuchman]

@rigelrozanski is this good to merge now re #1047 (comment) ?

[rigelrozanski]

Still left as far as I can tell: Implement GetFees and ClearFees in auth keeper - oh and clear testing on it!

[rigelrozanski]

@ebuchman nope - we are in agreement of the solution from the conversation but it needs to be implemented ^ see re-review comment

[sunnya97]

@rigelrozanski Should that be added in this same PR or in a separate PR? Created an issue for it: #1058

[cwgoes]

utACK, fees can be in this PR or not, fine either way IMO

[rigelrozanski]

@sunnya97 If it's in another PR we should add back the feehandler so there is a way of dealing with fees here - don't want to just remove a vital feature without replacing it. - it's simple enough to implement though so I'd opt to include the update in this PR

[jaekwon]

LGTM

[sunnya97]

@rigelrozanski Ok, see #1064

[codecov]

Codecov Report

Merging #1049 into develop will increase coverage by 0.3%.
The diff coverage is 79.41%.

@@            Coverage Diff             @@
##           develop    #1049     +/-   ##
==========================================
+ Coverage    60.58%   60.88%   +0.3%     
==========================================
  Files           79       81      +2     
  Lines         3968     4024     +56     
==========================================
+ Hits          2404     2450     +46     
- Misses        1405     1412      +7     
- Partials       159      162      +3

[rigelrozanski]

Looking good - just updated the changelog too