Templated function-files for Gladex to manipulate

Gladex should use templates for functions in the same way it does for the main program file and the callback functions file.

The getText() function will be implemented in gladex_functions.py

Gladex should provide a getText(<template file name>, variable1, variable2, ...) function which returns the text of a template file. The variables in this template file will be replaced with the corresponding value stated in the variable array.

For example, a pluging author might write code to generate functions code as follows:
# Generate functions text
getFunctionsText():
    functions_text = ""
    handlers = getHandlers()
    for each h in handlers:
        replacementArray = [[FUNCTION_NAME, h],[CONTENTS, ""Function not implemented""]]
        functions_text = functions_text + getText(function.template, replacementArray) + '\n'
    return functions_text

This eliminates the need for the author to hard code the function generation into their plugin. By making the getText() function generic it can be used for templating anything the author chooses.