Major refractor

- Add regex search and replace
- Add chunk iterator + update line iterator.
- Cleanup/formatting.

include/vase/search.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "pch.h"
+#include "vase/shard.h"
+
+struct RegexGroup {
+  uint32_t start;
+  uint32_t end;
+  bool matched;
+};
+
+struct RegexMatch {
+  uint32_t start;
+  uint32_t end;
+  std::vector<RegexGroup> groups{};
+};
+
+const std::vector<RegexMatch> regex_search(Shard *root, std::string_view pattern_str, uint32_t start_offset, uint32_t end_offset, uint32_t flags, bool global);
+void print_regex(const std::vector<RegexMatch> &matches);