KASL module system improvement

So far, KASL compiler didn’t allow us to import external programs with the same name, because the name of the namespace conflicts. Today I have added new alias feature, which can be used like this:

import foo as bar

With this syntax, you can import a program named foo.kasl and refer to it with bar.
This can also improve readability when importing a file with a long name!

Streamline compilation

I wanted to try compiling Kadent to application that can be installed using an installer, instead of a simple executable binary. I found Taskfile, which is a build tool similar to make but uses a yaml file to define workflows. I found it very useful so I adopted it and it worked very well! Currently I only have workflow for macOS compilation but I want to add Windows and Linux support soon!