[Dexter] Add option to pass a Visual Studio solution instead of a binary

This patch allows a visual studio solution file to be passed directly
into Dexter, instead of using a pre-built binary and a

[Dexter] Add option to pass a Visual Studio solution instead of a binary

This patch allows a visual studio solution file to be passed directly
into Dexter, instead of using a pre-built binary and a small internal
solution file with template arguments. This is primarily to allow
launching an application that has specific launch configuration
requirements, without needing all the details of this configuration to
be built directly into Dexter or adding a config file that simply
duplicates existing settings in the VS solution.

Reviewed By: Orlando

Differential Revision: https://reviews.llvm.org/D110167

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