Internal rigctld tweaks for windows users

[Mashintime]

• Process custom arguments for rigctld for all platforms
• Search c:\program files\Hamlib\bin for rigctld binaries on Windows
• Remove default custom args from example config

[DJ2LS]

Great, thanks @Mashintime
What about removing the 32bit version of Hamlib from build process ( nsis )?

@dk5sm might this fix your path problem you've reported?

[Mashintime]

NSIS? We should only support 64 bit in my opinion for binary packages.

But if a user wants to use a 32 bit version of hamlib, I see no issues with supporting that and checking if it's available.

[DJ2LS]

@Mashintime I've removed the 32bit build separately. We can merge if you want

[Mashintime]

I'm good with merging.