Safe unaligned access without #ifdefs

[taruti]

• Cleaner code
• Avoids #ifdefs for ARM (and ARM64 etc)
• Optimizes cleanly with modern compilers
• Less prone to errors
• I'm open to bikeshedding the function names, the idea is that they use native endianess thus decode/encode_native.
• This code has templates, but IMHO keeps them very simple, so it does not add cognitive overhead.

This is ok to postpone for NEXT (as long as ARM64 support is not needed).

[nohal]

Let's see, we can postpone it at any later moment...

[bdbcat]

Nice code...
Deferred until after O5 release.

[did-g]

Hi,
Is 32 bits stuff still relevant? There's more 'ifdef' unprotected unaligned 32 bits accesses in OpenCPN, nonetheless it's working on ARM.

[leamas]

Hi,

long time, no see... Personally, I think it's a pity that this code isn't merged. Have you motivation and time to rebase it?