Bob Nystrom
95626bb136
Replace the manually embedded C string constants for builtin Wren modules with a new build system that automatically generates `.wren.inc` header files from `.wren` source files. The old `script/generate_builtins.py` is removed and replaced by `script/wren_to_c_string.py`, which produces standalone include files with a `PREAMBLE` containing the module name and source path. The Makefile gains pattern rules to rebuild these `.wren.inc` files whenever the corresponding `.wren` source changes, and the `builtin` phony target is removed since the generation is now automatic. The `wren.mk` wildcard lists are updated to include the new `.wren.inc` files as dependencies. The `timer.c` and `wren_core.c` source files now `#include` their respective `.wren.inc` headers instead of defining the string literals inline, and the `timer.wren` trailing newline is removed.
The Wren scripts in this directory get converted to C string literals into files
with a .wren.inc extension. Those are then #included into their respective
.c files so that the interpreter can load them directly without having to do
any file IO.
The script that does this translation is script/wren_to_c_string.py.
When any of the ".wren" files in here are changed, the Makefile automatically updates the generated C headers.