Add V2/V4 Siglent BIN import filter

[hansemro]

Resolves #721.

This allows importing of analog/math/digital waveforms from V2/V4 Siglent BIN waveform formats. However, the current decoding implementation targets little endian systems and may not work on big endian systems.

Siglent scopes that export V2 BIN format:

• SDS2000X Plus with FW 1.2.6 to 1.3.9RX
• SDS5000X with FW 0.8.6 to 0.9.6
• SDS6000 with FW older than 1.4.1.0

Siglent scopes that export V4 BIN format:

• SDS2000X Plus with FW newer than 1.4.0
• SDS5000X with FW newer than 0.9.6
• SDS6000 with FW newer than 1.4.1.0
• SDS2000X HD

V2 and V4 spec details can be found on page 29 and 37 of E02A document, respectively.

E02A: https://web.archive.org/web/20230730072643/https://www.siglenteu.com/wp-content/uploads/2021/08/How-to-Extract-Data-from-the-Binary-File.pdf

[hansemro]

Defined Oscilloscope::ConvertUnsigned16BitSamples with generic, AVX2, and AVX2-FMA implementations.