FFmpeg is an integral component of ZM. Promote the appropriate libraries to required dependencies.
This reduces the possible build configurations greatly and thus maintenance burden.
Remove calls to zmDBConnect from various places to avoid possible side-effects/double initialization.
The function should be called once from the main thread of the daemon.
Also split config loading into 2 steps: static and DB config loading. Load the static config before zmDBConnect is called so it has a chance to succeed.
With this commit a unified structure for includes is introduced.
The general rules:
* Only include what you need
* Include wherever possible in the cpp and forward-declare in the header
The includes are sorted in a local to global fashion. This means for the include order:
0. If cpp file: The corresponding h file and an empty line
1. Includes from the project sorted alphabetically
2. System/library includes sorted alphabetically
3. Conditional includes
With this change IDEs have it easier to correctly reference the
variable/class declarations. Additionally one does not have to
regenerate the zm_config.h file when changing the code.