Create uninstall_dba-multitool.sql

[lowlydba]

Add an uninstall script!

[codecov]

Codecov Report

Merging #229 (d82fe83) into development (7ddd7f4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development     #229   +/-   ##
============================================
  Coverage        98.82%   98.82%           
============================================
  Files                4        4           
  Lines             3483     3493   +10     
============================================
+ Hits              3442     3452   +10     
  Misses              41       41           

Impacted Files	Coverage Δ
appveyor/sqlcover/[dbo].[sp_doc]	99.68% <100.00%> (+<0.01%)	⬆️
appveyor/sqlcover/[dbo].[sp_estindex]	98.83% <100.00%> (ø)
appveyor/sqlcover/[dbo].[sp_helpme]	99.60% <100.00%> (ø)
appveyor/sqlcover/[dbo].[sp_sizeoptimiser]	96.79% <100.00%> (ø)

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[lowlydba]

Turning off until tsqllint/tsqllint#282 is resolved