Re-implement octans, move subroutines to respective modules

Initially it went over the list of words & checked if they exist in
the grid. This was very slow.

Currently it walks the grid & checks if the current string exist in
the dictionary. This is faster for these reasons:

• The dictionary is sorted, we perform binary range search on the
  dictionary to return the list of all words that start with specific
  string.
• Starting positions are limited.

If the dictionary wasn't sorted then this probably would've been

1 files changed, 1 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4a5e4c7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+lib/.precomp