Include more programming languages in templates.

Currently only examples of python and matlab integrations are included in the latex.

Help expanding this list by:

0. Including a brief code in the following folders (make 1 folder, copy it 3 times):
```
CoursePlanningTemplate\processPlanning\assignmentTemplateResources/
CoursePlanningTemplate\processPlanning\exerciseTemplateResources/
CoursePlanningTemplate\processPlanning\lectureTemplateResources/
```

1. Next modify the `main_filler0.txt` in: `CoursePlanningTemplate\CoursePlanningTemplate\processPlanning\exerciseTemplateResources` to include support for that language (without harming the support for other languages).

Note. You can test this by generating 1 lecture for each programming language that is supported (and one for None) and compliing each of the latex lecture summary templates to see if the compilation is error free).

2. Create the VBA code (1 line) that creates an appendix named `App.tex` in subroutine named `create_appendices` in Module4 of `doPlanning.xlsm`.

For example for Matlab, I included a case that contains:
```
Case "Matlab"
appendix_content = "\section{Appendix: ExportPlotToLatex.m}\label{app:" & i & "}" & vbNewLine & "\lstinputlisting{../../code/hw" & i & "/ExportPlotToLatex.m}"
```
That's it.