Adds Linux CI support to FuncParser

[onwhenrdy]

Short rational:

• "Previous ubuntu" image was choosen because of a bug in current image version that prevents the display of test results

• After some tests the previous solution (https://github.com/roozbehid/dotnet-vcxproj) was discarded because of bugs in the package and unknown future compatibility

• An additional linux nuspec is mandatory (artifact naming should be discussed)

• The native component is compiled via cmake (minimal CMakeList that should follow future updates in src and include)

• Test Project needed a conditional Target that dispatch on OS (All other possibilities including WHEN and EXEC dispatch did not work for either dotnet build or msbuild)

• sed-hack is used to eleminate the native project from the solution and to allow the "normal" workflow of the project

• Source code patch (MACRO) was necessary since not all versions of libc include strcpy_s (it is optional according to the specs)

• Points to discuss:

  • Is this solution feasible?
  • Naming of the artifact

[Yuri05]

@onwhenrdy I wonder why I don't see any Linux tests in the appveyour build?

[onwhenrdy]

Argh ... the tests are fine but now even on the "previous ubuntu" box the tests are not registered by appveyor. I will investigate why this is happening now on this box. Last week the suggestion from appveyor was to use the "previous version".

[onwhenrdy]

Test registration now works on the current Ubuntu box. ¯_(ツ)_/¯