Move os layer to be part of the core

src/os/shell/termcolour/termcolour.h

@@ -1,21 +0,0 @@
-#ifndef TERM_COLOUR_H
-#define TERM_COLOUR_H
-
-#include "aliases.h"
-#include "terminal_colours.h"
-#include "str8.h"
-
-#ifdef __cplusplus
-BEGIN_C_LINKAGE
-#endif // __cplusplus
-
-void wapp_shell_termcolour_print_text(Str8RO *text, TerminalColour colour);
-void wapp_shell_termcolour_clear_colour(void);
-
-external void print_coloured_text(Str8RO *text, TerminalColour colour);
-
-#ifdef __cplusplus
-END_C_LINKAGE
-#endif // __cplusplus
-
-#endif // !TERM_COLOUR_H