Ability to assign a global variable to be stored in .rodata section

[gingerBill]

Ability to assign a global variable to be stored in .rodata section of the executable.

This will be achieved with an attribute (name undecided yet). It will most likely make the variable private to the package too by default since that thing it will be making private will most likely only be used by the package.

An important use case for this is for security purposes, especially with the new core:crypto.

[github-actions]

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[Tetralux]

This can currently be achived using:

// On Unixes:
@(link_section=".rodata")
my_global := "Hello, World"

// Or on Windows:
@(link_section=".rdata")
my_global := "Hello, World!"

However, there exists no way to just say "I want this to be read-only."
So you'd have to use some form of conditional compilation, in order to conditionally pick the section name accordingly.