OpenCppCoverage Plugin 0.9.4.2

Release Notes:
You need to install Visual Studio 2015 redistributable Update 3 vc_redist.x86.exe and vc_redist.x64.exe (for 64 bits operating system) and restart Visual Studio. Download link: https://www.microsoft.com/en-us/download/details.aspx?id=53587. You can also install both OpenCppCoverageSetup-x86-0.9.6.1.exe and OpenCppCoverageSetup-x64-0.9.6.1.exe.

Changelog:

• Add a button to select and deselect all projects (#9)
• Add better colors for different themes for covered and not covered lines (#10)
• Fix an issue when defining an environment variable in Visual Studio that alreay exists in the system environment.