Add marks and regex addressing systems

- Hook up parser to buffer edits.
- Other minor fixes.

include/internal/vase/vase.h

@@ -3,6 +3,7 @@
 #include "buffer/append.h"
 #include "buffer/original.h"
 #include "constants.h"
+#include "definitions.h"
 #include "iterators/line.h"
 #include "pch.h"
 #include "shard.h"
@@ -92,6 +93,9 @@ struct Vase {
     std::string_view pattern, Range range, std::string_view options
   );
 
+  uint64_t find_next(std::string_view pattern, uint64_t start);
+  uint64_t find_prev(std::string_view pattern, uint64_t start);
+
   bool undo();
   bool redo();
   void snapshot();