Support line- & column-based match locations

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+# librune — easy Unicode in a post-ASCII world
+
+Librune is a C library that aims to make interacting with Unicode and
+UTF-8 easy in C.  There are no plans at the moment to support UTF-16 or
+-32, but they may be supported if such a usecase ever comes up.
+
+This library has been tested to build and work properly on both C99 and
+C23.
+
+
+## Terminology
+
+This library uses the term ‘rune’ to refer to a single Unicode-codepoint,
+and defines a `rune` datatype which is an unsigned integer type which
+represents a rune (shocker).
+
+
+## Headers
+
+This library contains the following headers:
+
+1. `gbrk.h` — grapheme-iteration functions
+2. `rune.h` — rune-constants, -macros, and -functions
+3. `utf8.h` — UTF-8 encoding, decoding, iteration, etc.
+
+
+## Installation
+
+There is no ‘intended’ way in which this library should be installed,
+used, and distributed.  This library is primarily written for myself, and
+I prefer to vendor it in my projects.  You may choose to install it as a
+shared and/or static library.  You’re an engineer aren’t you?  Figure it
+out.