Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/if_cscope_defs.h

@@ -0,0 +1,71 @@
+#ifndef NEOVIM_IF_CSCOPE_DEFS_H
+#define NEOVIM_IF_CSCOPE_DEFS_H
+
+/*
+ * CSCOPE support for Vim added by Andy Kahn <kahn@zk3.dec.com>
+ * Ported to Win32 by Sergey Khorev <sergey.khorev@gmail.com>
+ *
+ * The basic idea/structure of cscope for Vim was borrowed from Nvi.
+ * There might be a few lines of code that look similar to what Nvi
+ * has.  If this is a problem and requires inclusion of the annoying
+ * BSD license, then sue me; I'm not worth much anyway.
+ */
+
+
+#if defined(UNIX)
+# include <sys/types.h>         /* pid_t */
+# include <sys/stat.h>          /* dev_t, ino_t */
+#else
+#endif
+
+#define CSCOPE_SUCCESS          0
+#define CSCOPE_FAILURE          -1
+
+#define CSCOPE_DBFILE           "cscope.out"
+#define CSCOPE_PROMPT           ">> "
+
+/*
+ * s 0name	Find this C symbol
+ * g 1name	Find this definition
+ * d 2name	Find functions called by this function
+ * c 3name	Find functions calling this function
+ * t 4string	find text string (cscope 12.9)
+ * t 4name	Find assignments to (cscope 13.3)
+ *   5pattern	change pattern -- NOT USED
+ * e 6pattern	Find this egrep pattern
+ * f 7name	Find this file
+ * i 8name	Find files #including this file
+ */
+
+typedef struct {
+  char *  name;
+  int (*func)(exarg_T *eap);
+  char *  help;
+  char *  usage;
+  int cansplit;                 /* if supports splitting window */
+} cscmd_T;
+
+typedef struct csi {
+  char *          fname;        /* cscope db name */
+  char *          ppath;        /* path to prepend (the -P option) */
+  char *          flags;        /* additional cscope flags/options (e.g, -p2) */
+#if defined(UNIX)
+  pid_t pid;                    /* PID of the connected cscope process. */
+#endif
+  uint64_t st_dev;                 /* ID of dev containing cscope db */
+  uint64_t st_ino;                 /* inode number of cscope db */
+
+  FILE *          fr_fp;        /* from cscope: FILE. */
+  FILE *          to_fp;        /* to cscope: FILE. */
+} csinfo_T;
+
+typedef enum { Add, Find, Help, Kill, Reset, Show } csid_e;
+
+typedef enum {
+  Store,
+  Get,
+  Free,
+  Print
+} mcmd_e;
+
+#endif  // NEOVIM_IF_CSCOPE_DEFS_H