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After calling nextHandler(), backspace completion should verify that …

Persist Interactive window visibility across VS restarts

Calculate snippet $end$ location based on column, not line length

Fix downgrade warnings in NuGet restore

Set ```__VSCREATETOOLWIN.CTW_fForceCreate``` as in
https://github.com/Microsoft/PTVS/blob/21e5600e090143ced879e60da4e88bf63b6b6f99/Python/Product/PythonTools/PythonTools/Repl/InteractiveWindowProvider.cs

Removing erroneous spaces that were added to cibuild.cmd

Adjusting uses of %RoslynRoot% in cibuild.cmd to no longer specify two consecutive path separator characters.

Adjusting uses of %RoslynRoot% in cibuild.cmd to no longer specify two consecutive path seperator characters.

Fix completion for #load...

Adding support for running our unit tests against the 64-bit runner in cibuild.cmd

Eliminate history test helpers

Clarify #help text

Add toolbar buttons for history navigation

Fixing a compat issue with invoking properties on generic type parameters in expression trees.

Fix syntax associated with bound implicit return statement

Move context.IsPreProcessorKeywordContext to beginning of all checks in overrides of AbstractSyntacticSingleKeywordRecommender.IsValidContext.

Implement NuGetPackageResolver

properly classify shebang comments in the IDE

Move "LoadCommandCompletionProvider" to the right layer and rename to "LoadDirectiveCompletionProvider".