rustycpp 0.1.6

An attempt to implement the C++20 standard. This is mostly to have fun & learn rust
# Changelog

### 0.1.6
 - Make the project easy to compile using git submodules

### 0.1.5
 - Module dependency tree generation has been completed, automatically adds TU for imported headers
 - A bit of lexing was done, but is not tested

### 0.1.2
Features:
 - Finish all critical features of the preprocessor
 - Implement conditional code inclussion
 - Implement header inclussion

### 0.1.1
I took on the project again. The "compiler" is now able to perform macro expansions, but no proper conditional inclusion of code, and certainly not inclusion. For the time being, I do not plan to include any pragmas or useful extensions that other implementations provide :)