Include "Figlet" and PEAR "Text_Figlet" in externals

Summary:
Ref T7785. This prepares for (but does not yet use) a pure PHP implementation of Figlet parsing and rendering.

Figlet is somewhat complex, but a parser already exists in PEAR. I'll make sure it's suitable and hook it up in the next diff.

Test Plan: N/A, code not reachable

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9408, T7785

Differential Revision: https://secure.phabricator.com/D14101

externals/figlet/inflate.h

@@ -0,0 +1,90 @@
+/*
+ * inflate.h -  inflate decompression routine
+ *
+ * Version 1.1.2
+ */
+
+/*
+ * Copyright (C) 1995, Edward B. Hamrick
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby granted,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of the copyright holders
+ * not be used in advertising or publicity pertaining to distribution of
+ * the software without specific, written prior permission. The copyright
+ * holders makes no representations about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT
+ * OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+/*
+ * Changes from 1.1 to 1.1.2:
+ * Relicensed under the MIT license, with consent of the copyright holders.
+ * Claudio Matsuoka (Jan 11 2011)
+ */
+
+/*
+ * 1) All file i/o is done externally to these routines
+ * 2) Routines are symmetrical so inflate can feed into deflate
+ * 3) Routines can be easily integrated into wide range of applications
+ * 4) Routines are very portable, and use only ANSI C
+ * 5) No #defines in inflate.h to conflict with external #defines
+ * 6) No external routines need be called by these routines
+ * 7) Buffers are owned by the calling routine
+ * 8) No static non-constant variables are allowed
+ */
+
+/*
+ * Note that for each call to InflatePutBuffer, there will be
+ * 0 or more calls to (*putbuffer_ptr).  All except the last
+ * call to (*putbuffer_ptr) will be with 32768 bytes, although
+ * this behaviour may change in the future.  Before InflatePutBuffer
+ * returns, it will have output as much uncompressed data as
+ * is possible.
+ */
+
+#ifndef __INFLATE_H
+#define __INFLATE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Routine to initialize inflate decompression */
+void *InflateInitialize(                      /* returns InflateState       */
+  void *AppState,                             /* for passing to putbuffer   */
+  int (*putbuffer_ptr)(                       /* returns 0 on success       */
+    void *AppState,                           /* opaque ptr from Initialize */
+    unsigned char *buffer,                    /* buffer to put              */
+    long length                               /* length of buffer           */
+  ),
+  void *(*malloc_ptr)(long length),           /* utility routine            */
+  void (*free_ptr)(void *buffer)              /* utility routine            */
+);
+
+/* Call-in routine to put a buffer into inflate decompression */
+int InflatePutBuffer(                         /* returns 0 on success       */
+  void *InflateState,                         /* opaque ptr from Initialize */
+  unsigned char *buffer,                      /* buffer to put              */
+  long length                                 /* length of buffer           */
+);
+
+/* Routine to terminate inflate decompression */
+int InflateTerminate(                         /* returns 0 on success       */
+  void *InflateState                          /* opaque ptr from Initialize */
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif