Find/Decide on a portable path for Texts, Display, Fonts

[rsdoiel]

Texts is used in most Oberon System Programs. There are two general use cases in a POSIX environment.

1. Integrated into a graphical application
2. Headless in an command line application

In a GUI target implementing Display on top of SDL2 makes allot of sense given the ability to wrap C code in a POSIX implementation of Oberon-07.

In a headless use case we could just use a dummy Display and Fonts. Which Display and Fonts included in a compiled program could be controlled via module include paths.