Added more options to conferences.

Now the icb conferences are close to the pcboard ones.

Only things missing are:  maintain old msgs.index and last message exported.
Not sure if any of these make sense. Last Message Exported should be stored somewhere else.
Doesn't make sense.

And .NDX would rely on the PCB Mail format which is no longer used.

crates/icy_board_engine/src/icy_board/conferences.rs

@@ -18,14 +18,50 @@ use super::{
     commands::Command,
     doors::DoorList,
     file_directory::DirectoryList,
-    is_false, is_null_16, is_null_8, is_null_i32,
+    is_false, is_null_16, is_null_8, is_null_f64, is_null_i32,
     message_area::{AreaList, MessageArea},
     pcbconferences::{PcbAdditionalConferenceHeader, PcbConferenceHeader},
     security_expr::SecurityExpression,
     user_base::Password,
     IcyBoardSerializer,
 };
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub enum ConferenceType {
+    #[default]
+    Normal,
+    InternetEmail,
+    InternetUsenet,
+    UsnetModeratedNewsgroup,
+    UsnetPublicNewsgroup,
+    FidoConference,
+}
+
+impl ConferenceType {
+    pub fn from_u8(value: u8) -> Self {
+        match value {
+            0 => Self::Normal,
+            1 => Self::InternetEmail,
+            2 => Self::InternetUsenet,
+            3 => Self::UsnetModeratedNewsgroup,
+            4 => Self::UsnetPublicNewsgroup,
+            5 => Self::FidoConference,
+            _ => Self::Normal,
+        }
+    }
+
+    pub fn to_u8(&self) -> u8 {
+        match self {
+            Self::Normal => 0,
+            Self::InternetEmail => 1,
+            Self::InternetUsenet => 2,
+            Self::UsnetModeratedNewsgroup => 3,
+            Self::UsnetPublicNewsgroup => 4,
+            Self::FidoConference => 5,
+        }
+    }
+}
+
 #[serde_as]
 #[derive(Default, Clone, Serialize, Deserialize)]
 pub struct Conference {
@@ -128,6 +164,13 @@ pub struct Conference {
     #[serde(skip_serializing_if = "is_false")]
     pub long_to_names: bool,
 
+    #[serde(default)]
+    #[serde(skip_serializing_if = "is_false")]
+    pub force_echomail: bool,
+
+    #[serde(default)]
+    pub conference_type: ConferenceType,
+
     pub users_menu: PathBuf,
     pub sysop_menu: PathBuf,
     pub news_file: PathBuf,
@@ -173,8 +216,16 @@ pub struct Conference {
     #[serde(skip)]
     pub doors: DoorList,
 
+    #[serde(default)]
+    #[serde(skip_serializing_if = "is_null_f64")]
     pub charge_time: f64,
+
+    #[serde(default)]
+    #[serde(skip_serializing_if = "is_null_f64")]
     pub charge_msg_read: f64,
+
+    #[serde(default)]
+    #[serde(skip_serializing_if = "is_null_f64")]
     pub charge_msg_write: f64,
 }
 
@@ -270,6 +321,8 @@ impl ConferenceBase {
                 record_origin: d.record_origin,
                 prompt_for_routing: d.prompt_for_routing,
                 long_to_names: d.long_to_names,
+                force_echomail: d.force_echo,
+                conference_type: ConferenceType::from_u8(d.conf_type),
             };
             confs.push(new);
         }

crates/icy_board_engine/src/icy_board/mod.rs

@@ -643,6 +643,10 @@ pub fn is_null_i32(b: impl std::borrow::Borrow<i32>) -> bool {
     *b.borrow() == 0
 }
 
+pub fn is_null_f64(b: impl std::borrow::Borrow<f64>) -> bool {
+    *b.borrow() == 0.0
+}
+
 const UTF8_BOM: [u8; 3] = [0xEF, 0xBB, 0xBF];
 
 pub fn read_with_encoding_detection<P: AsRef<Path>>(path: &P) -> Res<String> {

crates/icy_board_engine/src/icy_board/pcb/pcbconferences.rs

@@ -402,7 +402,7 @@ impl PcbConferenceHeader {
 
 #[derive(Default, Clone, Debug)]
 pub struct PcbAdditionalConferenceHeader {
-    pub force_echo: bool,
+    pub force_echo: bool,         // *
     pub read_only: bool,          //*
     pub no_private_msgs: bool,    // *
     pub ret_receipt_level: u8,    // *