DEV9: Add support for external HDD ID

[AKuHAK]

This commit introduces the capability to read the content of a *.hddid file located in the same directory as the HDD image (same name, different extension). The retrieved content is then used to fill the SCE_IDENTIFY_DRIVE response.

Description of Changes

Some PS2 apps requires that SCE_IDENTIFY_DRIVE not only return true, but also needs proper content of its response. The response is unique for each HDD.

Rationale behind Changes

It improves previous #9263 Next step to the PlayOnline Viewer games and BB Navigator games support.

PlayOnline Viewer games:

• Final Fantasy XI: Online NTSC-U http://redump.org/disc/15026/
• Final Fantasy XI: Online NTSC-J http://redump.org/disc/79596/
• Tetra Master NTSC-U http://redump.org/disc/5794/
• Tetra Master NTSC-J http://redump.org/disc/27151/
• Janhourou http://redump.org/disc/27151/
• Front Mission Online http://redump.org/disc/41390/
• Dirge of Cerberus: Final Fantasy VII http://redump.org/disc/28888/

BB Navigator games:

• Nobunaga No Yabou Online http://redump.org/disc/34358/
• Net de Bomberman
• Bishi Bashi Special 3 [Trial Version]
• C@m Station http://redump.org/disc/77793/

Misc games:

• Catan TRIAL
• Pop'n Taisen Puzzle-Dama Online http://redump.org/disc/56537/
• Kotoba No Puzzle: Mojipittan [Trial Version] http://redump.org/disc/23326/

Suggested Testing Steps

This requires specially prepared HDD images, that are not currently publicly available.

[TheLastRar]

This attempt does fix the issue I noted in the prior pr #9263 (comment), so nice work