Adding visual studio solution file generation

* Does not generate vcxproj file or vcxproj.filters files.
* Fixing executer to test 'executable' parameter on the plugin before attempting to execute.
* Fixing spacing in various minions.
* Deleting old visual studio generator source file.
Revert "Adding Executable Python Plugins"

This reverts commit 6389bc24dc915684592c6d545eb095e978a0fcc3.