[FEATURE] Check for required programs at wahooMapsCreator start (#127)

* implement check for required programs for macOS

- incl. unittests

* move get_tooling_win_path to constants_functions

* implement check for required programs for Windows

- incl. unittests

* adjustments after testing on Windows. Extension needed

* verbose output for osmium processing

* catch error if no file exists in plugins directory

* format terminal output when checking for required programs

* move get_tag_wahoo_xml_path to constants_functions

to be identical with changes from eab0345

* Revert "verbose output for osmium processing"

This reverts commit a700f68.
It is not working as intended on macOS // not outputting something. Most likely because of the "subprocess.Popen" stlye of calling the command

* Bump to version v2.1.0a15

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = wahoomc
-version = 2.0.2
+version = 2.1.0a15
 author = Benjamin Kreuscher
 author_email = [email protected]
 description = Create maps for your Wahoo bike computer based on latest OSM maps