Try only using SQLDriverConnect for connections

[quinnj]

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[codecov-commenter]

Codecov Report

Merging #268 into master will increase coverage by 1.12%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
+ Coverage   72.19%   73.32%   +1.12%     
==========================================
  Files           5        5              
  Lines         651      641      -10     
==========================================
  Hits          470      470              
+ Misses        181      171      -10     

Impacted Files	Coverage Δ
src/API.jl	60.37% <60.00%> (+2.71%)	⬆️

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[quinnj]

It turns out this resolves some other long-standing oddities because driver managers use an application's initial call of SQLDriverConnect or SQLDriverConnectW as a cue to whether it's a unicode application or not. It removes the need to special-case windows in the execute statements.