Add web app frontend, restructure almost everything

- Add web app frontend code
- Add .html, .js, .wasm to .gitignore
- Restructure Makefile to work with emmake, add build targets for web app,
  add .html, .js, .wasm to make clean
- Explain the pattern in the README
- Add explanation of web frontend to README
- Restructure README generally for better clarity
- Remove "make web app version" from todos in README
- Set Doxygen to EXTRACT_ALL so trivial and useless doc comments are not
  needed when the naming suffices to be explanatory.
- Move ascii_binary_str_to_ints to library code in new file
  hitomezashi_utils.c (and corresponding header) as web app also needs it.
- Fix SDL2 include path so it also works with Emscripten
- Remove some cluttering and unnecessary doc comments
- Improve some doc comments

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/hitomezashi_utils.h b/lib/hitomezashi_utils.h
new file mode 100644
index 0000000..040ea00
--- /dev/null
+++ b/lib/hitomezashi_utils.h
@@ -0,0 +1,17 @@
+/** @file
+ * Utilities connected with hitomezashi patterns that may be useful to
+ * applications.
+ */
+#ifndef HITOMEZASHI_UTILS_H
+#define HITOMEZASHI_UTILS_H
+
+#include <stddef.h>
+
+/** Convert a string of ASCII digit 0s and 1s, eg. "1010", to a char array of
+ * numeric 0s and 1s. The return value is **dynamically allocated and must
+ * be freed**.
+ * @param len Length of ascii_str, not including any terminating null bytes.
+ */
+char *hitomezashi_ascii_binary_str_to_ints(char *ascii_str, size_t len);
+
+#endif // HITOMEZASHI_UTILS_H