Whether or not to remove support for built-in variables in script scope?

[waruqi]

Built-in variables, for example: $(buildir), $(arch), $(plat) ...

With the growing number of modules in the scripting scope, there are now hundreds of modules and tens of thousands of module APIs, it is not possible to support built-in variables for all parameters of all script module APIs. This leads to a lot of confusion.

Some of the current interfaces that support built-in variables in scripts:

• print
• os.execv/os.runv ...
• os.cp/os.mv/...

In the script domain, we can call the module interface directly to get the values of these variables, e.g. config.plat(), os.projectdir() ...

Therefore, I think it would be clearer for users to just keep support for built-in variables in the description scope.