comFramework gets a new, auxiliary code generator using Excel as database

[Peter Vranken]

A new installation of comFramework has been uploaded. Here are the
changes:

excelExporter:

This is a new, auxiliary code generator, which is bundled with
comFramework the first time. It parses the Excel input files and renders
the contents with the StringTemplate V4 template engine.

canInterface:

A fix of template
comFramework\canInterface\components\arduinoSampleIntegration\code\codeGen\templates\lib\mod.stg:
The validation of the required code generator revision was bad and let to
a rejection of the template. The related C source file cbk_callbacks.c was
not generated, although everything was actually alright.

codeGenerator:

Only minor documentation improvements.