moonc doesn't handle absolute paths

[Nachtschatten]

When I specify absolute paths for the output directory and for files to compile, moonc replies with "Invalid argument", while the equivalent relative paths work.

Example command: moonc -t C:\Example\Path\lua C:\Example\Path\src\foo1.moon Will result in: C:\Example\Path\src\foo1.moon C:\Example\Path\lua\C:\Example\Path\src\foo1.lua: Invalid argument

However, the command (while in C:\Example\Path): moonc -t lua src\foo1.moon works: Built src\foo1.moon

This seems to relate to #342. Apparently, the two absolute paths get concatenated as-is. I'm not sure if absolute paths are unsupported. If they are, this should be noted in moonc's help output.