ENH: Better error msg on connect, Deprecate platform arg

[ZLLentz]

Description

• Provide better error messages for connect
• Deprecate the platform arg in favor of scanning for the correct platform

Motivation and Context

closes #5

How Has This Been Tested?

Tests added, and quality time spent in SXR testing with a real daq.

Where Has This Been Documented?

Change notes and docstring edits

[codecov-io]

Codecov Report

Merging #24 into master will decrease coverage by 0.23%. The diff coverage is 96.29%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   99.47%   99.23%   -0.24%     
==========================================
  Files           2        2              
  Lines         381      393      +12     
==========================================
+ Hits          379      390      +11     
- Misses          2        3       +1

Impacted Files	Coverage Δ
pcdsdaq/daq.py	99.44% <96.29%> (-0.27%)	:arrow_down:

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[ZLLentz]

For the record it takes literally zero seconds to scan the platforms

[teddyrendahl]

And there are no use cases we run two DAQs on the same machine with different platforms?

[ZLLentz]

I can't imagine a single user deciding to run two DAQs off the same workstation rather than integrating all the devices into the same data stream.

[ZLLentz]

@teddyrendahl I also want to merge this one because it makes my testing easier. I can walk into any hutch and open hutch-python with no conf.yml and the daq just works. It's neat.