v0.4

Look in README.md for instructions for using the compiler, and do note that it currently only supports Windows x64. If you use the compiler's interpreted mode -i, it needs no other dependencies and can just be run as an executable. If you use the compiler's executable output mode -o, you will need to use a C compiler and linker for the final step.

Changes:

• Added string literals.
• Added || and && operators for booleans.
• Fixed struct exporting.
• Changed the entry point name from 'eme' to 'main'.
• Added num_cast for integer and float casting.
• Added interpreted foreign function 'exit' which behaves like it does in C.
• Added global integer constants.
• Added 'unique' type definitions.
• Added #export for uniques, global constants, and imports.
• Fixed many small errors.
• Added f32, f64, and float.
• Added a timer for determining compilation speed on Windows, as well as an extra compilation mode -b.