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, 22 insertions, 0 deletions

diff --git a/lib/hitomezashi_utils.c b/lib/hitomezashi_utils.c
new file mode 100644
index 0000000..32832de
--- /dev/null
+++ b/lib/hitomezashi_utils.c
@@ -0,0 +1,22 @@
+#include "hitomezashi_utils.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+
+char *hitomezashi_ascii_binary_str_to_ints(char *ascii_str, size_t len) {
+  char *res = malloc(len);
+  for (int i = 0; i < len; ++i) {
+    switch (ascii_str[i]) {
+    case '0':;
+      res[i] = 0;
+      break;
+    case '1':;
+      res[i] = 1;
+      break;
+    default:;
+      free(res);
+      return NULL;
+    }
+  }
+  return res;
+}