Use constant size generic parameter for random bytes generation

All uses of `get_random()` were in the form of:

  `&get_random(vec![0u8; SIZE])`

with `SIZE` being a constant.

Building a `Vec` is unnecessary for two reasons. First, it uses a
very short-lived dynamic memory allocation. Second, a `Vec` is a
resizable object, which is useless in those context when random
data have a fixed size and will only be read.

`get_random_bytes()` takes a constant as a generic parameter and
returns an array with the requested number of random bytes.

Stack safety analysis: the random bytes will be allocated on the
caller stack for a very short time (until the encoding function has
been called on the data). In some cases, the random bytes take
less room than the `Vec` did (a `Vec` is 24 bytes on a 64 bit
computer). The maximum used size is 180 bytes, which makes it
for 0.008% of the default stack size for a Rust thread (2MiB),
so this is a non-issue.

Also, most of the uses of those random bytes are to encode them
using an `Encoding`. The function `crypto::encode_random_bytes()`
generates random bytes and encode them with the provided
`Encoding`, leading to code deduplication.

`generate_id()` has also been converted to use a constant generic
parameter as well since the length of the requested String is always
a constant.

src/db/models/device.rs

@@ -48,7 +48,7 @@ impl Device {
         use crate::crypto;
         use data_encoding::BASE64;
 
-        let twofactor_remember = BASE64.encode(&crypto::get_random(vec![0u8; 180]));
+        let twofactor_remember = crypto::encode_random_bytes::<180>(BASE64);
         self.twofactor_remember = Some(twofactor_remember.clone());
 
         twofactor_remember
@@ -69,7 +69,7 @@ impl Device {
             use crate::crypto;
             use data_encoding::BASE64URL;
 
-            self.refresh_token = BASE64URL.encode(&crypto::get_random_64());
+            self.refresh_token = crypto::encode_random_bytes::<64>(BASE64URL);
         }
 
         // Update the expiration of the device and the last update date