Force disable parallel font enumeration, significantly reducing the number of crashes with code -1073741819 (0xC0000005). It does not fully resolve them, but startup crashes are now rare rather than common.

• This is an option built-in to Affinity by passing a CLI argument. This patch enables it by default.
• In theory this extends load times on systems with lots of fonts. Given most Linux distros do not ship with hundreds of fonts like Windows does, most users likely won't notice a difference.
• Users can toggle this patch off in APL settings if they do find it significantly slows down startup for them.
• Unsure why this helps, should investigate further in the future. Crash occurs during font enumeration ("Loading fonts" indicator on splash card) somewhere in libkernel.dll

Resolves #26