[FL-1542], [FL-1603] Generate random name (#602)

* Lib: add random name library
* Text_input: add default text clearing
* All: rework all applications with new text_input API
* Nfc: fix removing dev file on save_name scene enter
* Lib: move all free radicals to toolbox and update API usage.

Co-authored-by: あく <alleteam@gmail.com>

lib/toolbox/hex.c

@@ -0,0 +1,16 @@
+#include "hex.h"
+
+bool hex_char_to_hex_nibble(char c, uint8_t* nibble) {
+    if((c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')) {
+        if((c >= '0' && c <= '9')) {
+            *nibble = c - '0';
+        } else if((c >= 'A' && c <= 'F')) {
+            *nibble = c - 'A' + 10;
+        } else {
+            *nibble = c - 'a' + 10;
+        }
+        return true;
+    } else {
+        return false;
+    }
+}