cm_crowdin: combine the two sync scripts

cm_crowdin_sync_all.py is a simple merge of the two sync scripts.
It doesn't contain any optimisations. It should just be able to sync
properly with Crowdin (no interference from the other project) and
combine all translations for a project in a single Gerrit change.

PS5: Make the script executable
PS6: Name 'step 3' properly
PS7: Fix retrieval of possible changed files for commit creation
PS8: Fix PS7
PS9: Fix use of *.yaml files and name in the header
PS10: Fix use of cm .yaml file & name final step properly
PS11: Move caf.xml & extra_packages.xml to crowdin folder
PS12: Remove old sync scripts
PS13: Fix *.yaml typos
 * Fix alphabetical order file check
 * Removed useless debug message
 * Readd imports
PS14: Remove unused import
PS15: Fix message typos

Change-Id: I361825d14757aa110a725b6644b9c21321210113