(svn r1821) Move generic string handling functions to string.[ch] and introduce stre{cpy,cat}, see string.h for their semantics

string.h

@@ -0,0 +1,24 @@
+#ifndef STRING_H
+#define STRING_H
+
+/*
+ * dst: destination buffer
+ * src: string to copy/concatenate
+ * size: size of the destination buffer
+ * usage: ttd_strlcpy(dst, src, lengthof(dst));
+ */
+void ttd_strlcat(char *dst, const char *src, size_t size);
+void ttd_strlcpy(char *dst, const char *src, size_t size);
+
+/*
+ * dst: destination buffer
+ * src: string to copy
+ * last: pointer to the last element in the dst array
+ *       if NULL no boundary check is performed
+ * returns a pointer to the terminating \0 in the destination buffer
+ * usage: strecpy(dst, src, lastof(dst));
+ */
+char* strecat(char* dst, const char* src, const char* last);
+char* strecpy(char* dst, const char* src, const char* last);
+
+#endif