Macro recursion decrease and other optimizations

- Decreased `recursion_limit` from 512 to 87
  Mainly done by optimizing the config macro's.
  This fixes an issue with the rust-analyzer which doesn't go beyond 128
- Removed Regex for masking sensitive values and replaced it with a map()
  This is much faster then using a Regex.
- Refactored the get_support_json macro's
- All items above also lowered the binary size and possibly compile-time
- Removed `_conn: DbConn` from several functions, these caused unnecessary database connections for functions who didn't used that at all
- Decreased json response for `/plans`
- Updated libraries and where needed some code changes
  This also fixes some rare issues with SMTP https://github.com/lettre/lettre/issues/678
- Using Rust 2021 instead of 2018
- Updated rust nightly

src/util.rs

@@ -282,9 +282,9 @@ pub fn delete_file(path: &str) -> IOResult<()> {
     res
 }
 
-const UNITS: [&str; 6] = ["bytes", "KB", "MB", "GB", "TB", "PB"];
-
 pub fn get_display_size(size: i32) -> String {
+    const UNITS: [&str; 6] = ["bytes", "KB", "MB", "GB", "TB", "PB"];
+
     let mut size: f64 = size.into();
     let mut unit_counter = 0;
 
@@ -359,10 +359,10 @@ where
     try_parse_string(get_env_str_value(key))
 }
 
-const TRUE_VALUES: &[&str] = &["true", "t", "yes", "y", "1"];
-const FALSE_VALUES: &[&str] = &["false", "f", "no", "n", "0"];
-
 pub fn get_env_bool(key: &str) -> Option<bool> {
+    const TRUE_VALUES: &[&str] = &["true", "t", "yes", "y", "1"];
+    const FALSE_VALUES: &[&str] = &["false", "f", "no", "n", "0"];
+
     match get_env_str_value(key) {
         Some(val) if TRUE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(true),
         Some(val) if FALSE_VALUES.contains(&val.to_lowercase().as_ref()) => Some(false),
@@ -375,7 +375,6 @@ pub fn get_env_bool(key: &str) -> Option<bool> {
 //
 
 use chrono::{DateTime, Local, NaiveDateTime, TimeZone};
-use chrono_tz::Tz;
 
 /// Formats a UTC-offset `NaiveDateTime` in the format used by Bitwarden API
 /// responses with "date" fields (`CreationDate`, `RevisionDate`, etc.).
@@ -393,7 +392,7 @@ pub fn format_datetime_local(dt: &DateTime<Local>, fmt: &str) -> String {
     // Try parsing the `TZ` environment variable to enable formatting `%Z` as
     // a time zone abbreviation.
     if let Ok(tz) = env::var("TZ") {
-        if let Ok(tz) = tz.parse::<Tz>() {
+        if let Ok(tz) = tz.parse::<chrono_tz::Tz>() {
             return dt.with_timezone(&tz).format(fmt).to_string();
         }
     }
@@ -442,7 +441,7 @@ use serde_json::{self, Value};
 
 pub type JsonMap = serde_json::Map<String, Value>;
 
-#[derive(PartialEq, Serialize, Deserialize)]
+#[derive(Serialize, Deserialize)]
 pub struct UpCase<T: DeserializeOwned> {
     #[serde(deserialize_with = "upcase_deserialize")]
     #[serde(flatten)]
@@ -517,6 +516,8 @@ fn upcase_value(value: Value) -> Value {
     }
 }
 
+// Inner function to handle some speciale case for the 'ssn' key.
+// This key is part of the Identity Cipher (Social Security Number)
 fn _process_key(key: &str) -> String {
     match key.to_lowercase().as_ref() {
         "ssn" => "SSN".into(),