Improvements for v2.0.0

[loelkes]

Fixes

• 564f17c Fixes the issue where the MQTT only starts if the Broker IP is 127.0.0.1
• c797c15 Use the available credentials for MQTT

  New features

• 8bdb805 Add a volume parameter for the buzzer
• f7c528c Add possibility to enable a debug log
• 3887445 Allow setting a default SSID and passwort without using the webinterface

  Miscellaneous

• 69cae5a daeff30 9b6d655 Refactor, improve code aesthetics
• 3ad5430 c58c5d1 b297c5b Update documentation and logging verbosity

Includes the PR #6 from @reibuehl and fixes #2

[loelkes]

Since the changes in Config.h such as the renaming of constants following a more consistent logic involve incompatible API changes I suggest incrementing the major version. This would lead to v2.0.0

[mariolukas]

Thank you. I will do a release 2.0.0

[mariolukas]

Forgot the merge before closing this PR.

[loelkes]

@mariolukas This was not merged? The new release does not contain any of this?

[mariolukas]

You are right, something went wrong. Just fixed it.