🐛 Move source into src/ to fix install

Installing was broken since moving to pyproject.toml, which we didn't notice because of
leftover files in build/. Fix this by using the convention of having the source files
in src/ and adjusting pyproject.toml accordingly.

Fixes gh-86. 🤞

src/dinglehopper/align.py

@@ -0,0 +1,44 @@
+from .edit_distance import *
+from rapidfuzz.distance import Levenshtein
+
+
+def align(t1, t2):
+    """Align text."""
+    s1 = list(grapheme_clusters(unicodedata.normalize("NFC", t1)))
+    s2 = list(grapheme_clusters(unicodedata.normalize("NFC", t2)))
+    return seq_align(s1, s2)
+
+
+def seq_align(s1, s2):
+    """Align general sequences."""
+    s1 = list(s1)
+    s2 = list(s2)
+    ops = Levenshtein.editops(s1, s2)
+    i = 0
+    j = 0
+
+    while i < len(s1) or j < len(s2):
+        o = None
+        try:
+            ot = ops[0]
+            if ot[1] == i and ot[2] == j:
+                del ops[0]
+                o = ot
+        except IndexError:
+            pass
+
+        if o:
+            if o[0] == "insert":
+                yield None, s2[j]
+                j += 1
+            elif o[0] == "delete":
+                yield s1[i], None
+                i += 1
+            elif o[0] == "replace":
+                yield s1[i], s2[j]
+                i += 1
+                j += 1
+        else:
+            yield s1[i], s2[j]
+            i += 1
+            j += 1