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As such, hopefully, it's not really used widely anymore. If so, this
note isn't really relevant.

Also, make the note generic, to omit the need to update it "constantly".

Closes #76

This shouldn't make a big difference in the CLI/extension
usage, but might improve the performances of long-running
instances, or people misusing the API.

Rework the dependencies definition to include a 'required' flags, which
is passed by the check_dependencies helper to the callers, so that they
can distinguish between required and optional dependencies.

This help in two ways:
- The unit test for the dependencies was now failing when an optional
  one was missing, due to a previous rework.
- Mat2's --check-dependencies was referring to "required dependencies"
  and was misleading for the user as some of them could be optional.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Remove the try/except logic when calling check_dependencies, as it
cannot throw the exception anymore (it's caught already in the
function).
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

This should ensure that if we decide to implement
some threading in the cli, a faulty file
won't break everything.

This one was spotted by @fuzzy

Apparently, mypy isn't able (yet?) to deal
with variables that are changing their types
at runtime.

Python is wonderful.

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

The command line checks for command line utilities are done by trying to
access the executables and by throwing an exception when not found. This
lead to:
- The mat2 cmd line --check-dependencies option failing.
- The ffmpeg unit tests failing when ffmpeg isn't installed (even though
  it's an optional dependency).

This patch fixes it.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Invert the keys and values in DEPENDENCIES. It seems more natural to use
the key as a key in check_dependencies(), and the value as the value.
This also help in preparing for reworking the check_dependencies()
helper.
Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>