Use inline to vastly simplify the exposed API. This allows a
comptime-known endian parameter to be propogated, making extra functions
for a specific endianness completely unnecessary.
Most of this migration was performed automatically with `zig fmt`. There
were a few exceptions which I had to manually fix:
* `@alignCast` and `@addrSpaceCast` cannot be automatically rewritten
* `@truncate`'s fixup is incorrect for vectors
* Test cases are not formatted, and their error locations change
In addition, we need to be careful not to mark the relocations as
resolved prematurely as then we are risking malforming the binary
as we need to resolve the relocs twice: once for in-memory writes,
and once for in-file updates.
Instead, introduce a custom ImportTable structure which will
act as a thunk in the MachO linker, and we will use that to
calculate the address of a pointer on-the-fly.
Additionally, fix logic in writeImportTables to allow for multiple
DLLs.
