Rename to RTNode-HeltecV4, replace 'boundary' with 'transport' in docs

- Rename project from RNodeTHV4 to RTNode-HeltecV4
- Update GitHub repo URL, firmware binary names (rtnode_heltec_v4.bin, rtnode_heltec_v3.bin)
- Replace 'boundary node' with 'transport node' in README and flash.py descriptions
- Update OLED title bar to 'RTNode'
- Bump version to v1.0.18

Display.h

@@ -56,6 +56,10 @@ struct BoundaryState {
     uint16_t ap_tcp_port;
     char     ap_ssid[33];
     char     ap_psk[33];
+    // IFAC settings for LoRa interface
+    bool     ifac_enabled;
+    char     ifac_netname[33];
+    char     ifac_passphrase[33];
     bool     wifi_connected;
     bool     tcp_connected;       // Backbone (WAN) connected
     bool     ap_tcp_connected;    // Local TCP server (LAN) has client
@@ -940,7 +944,7 @@ void draw_disp_area() {
       disp_area.setTextColor(SSD1306_BLACK);
       disp_area.setTextSize(1);
       disp_area.setCursor(4, 7);
-      disp_area.print("RNodeTHV4");
+      disp_area.print("RTNode");
 
       disp_area.setTextColor(SSD1306_WHITE);