DolphinQt: Extract creator name from code name in Gecko codes.

[cristian64]

Gecko codes in Dolphin feature a dedicated field for the creator of the cheat code. When saved into the INI file, the code name and the creator name are concatenated, and then inserted in the [Gecko] section:

[Gecko]
$<cheat code name> [<creator>]
<code line 1>
<code line 2>
<code line 3>
<...>
$<other cheat code name> [<creator>]
<code line 1>
<code line 2>
<code line 3>
<...>

On the other hand, enabled codes are listed under the [Gecko_Enabled] section, but in this case the creator name is omitted from the line:

[Gecko_Enabled]
$<cheat code name>
$<other cheat code name>

Having the creator name in the [Gecko] section but not in the [Gecko_Enabled] section is arguably not ideal, but this is legacy behavior in Dolphin.

The Cheat Code Editor dialog is not acknowledging this subtle behavior in Dolphin: the cheat code name and the creator name can be both inserted in the name field. This issue manifests as an inconsistent state where a Gecko code that appears to be enabled has no effect when the game is launched.

As part of this fix, the creator name (if present) is now moved into the dedicated creator field before the code is stored internally.

Test plan:

• Right-click on any game and open the Properties dialog.
• Switch to the Gecko Codes tab.
• Press the Add New Code... button.
• In the Cheat Code Editor dialog:
  • Enter This is a test [Jane Doe] in the Name: field.
  • Enter 01234567 00000000 in the Code: field.
  • Press Save.
• Observe that the newly added code is now in the list, and appears to be enabled.
• Close the Properties dialog.
• Right-click on the same game and open the Properties dialog again.

Without the fix, the newly added code, while still on the list, has been inadvertently disabled (it was never really enabled!).

With the fix, the newly added code is the list and remains enabled.

This fixes https://bugs.dolphin-emu.org/issues/13695.

[cristian64]

#13217 and #13218 are mutually exclusive.