Issue/138 build ffprobe command

[Euklios]

Allow a customized FFprobe report.

Tasks:

• [x] Extend output with -show_packets
• [x] Extend output with -show_frames
• [x] Handle intermixed reports (-show_packets and -show_frames together produce a rather weird combined response)
• [x] Allow running custom commands similar to FFmpeg (taking a list as input)
• [x] Create an FFprobeBuilder

Fix #138

[Euklios]

Added a builder to FFprobe. Additionally implemented -show_packets and -show_frames. There are some weird shenanigans if both -show_packets and -show_frames are set. Rather than producing two distinct lists, they merge into one giant list.

The builder provides default values aligned with the original default command. -show_packets and -show_frames can be relatively slow; therefore, they are disabled by default.

[Euklios]

@bramp I've updated this pr with the changes merged in #254. This would also replace #203