fix!: refactor ignore-case functionality to actually work.

The new implementation does the same as Git, and initializes
an alternative lookup location.

All previous implementations with `_icase` suffix were removed
without replacement.

Author: Byron

Cargo.lock

@@ -658,7 +658,9 @@ The git staging area.
 * `stat` update
     * [ ] optional threaded `stat` based on thread_cost (aka preload)
 * [x] handling of `.gitignore` and system file exclude configuration
-* [ ] handle potential races
+* [x] lookups that ignore the case
+    * [ ] multi-threaded lookup table generation with the same algorithm as the one used by Git
+    * [ ] expand sparse folders (don't know how this relates to traversals right now)
 * maintain extensions when altering the cache
     * [ ] TREE for speeding up tree generation
     * [ ] REUC resolving undo

crate-status.md

@@ -28,6 +28,8 @@ gix-traverse = { version = "^0.37.0", path = "../gix-traverse" }
 gix-lock = { version = "^13.0.0", path = "../gix-lock" }
 gix-fs = { version = "^0.10.0", path = "../gix-fs" }
 
+hashbrown = "0.14.3"
+fnv = "1.0.7"
 thiserror = "1.0.32"
 memmap2 = "0.9.0"
 filetime = "0.2.15"