Rework Cmd exposed API, use more static and fix [-Wmissing-prototypes], ongoing...

client/cmddata.c

@@ -1141,7 +1141,7 @@ int PSKDemod(const char *Cmd, bool verbose) {
     return 1;
 }
 
-int CmdIdteckDemod(const char *Cmd) {
+static int CmdIdteckDemod(const char *Cmd) {
     (void)Cmd; // Cmd is not used so far
 
     if (!PSKDemod("", false)) {
@@ -1202,6 +1202,11 @@ int CmdIdteckDemod(const char *Cmd) {
     return 1;
 }
 
+int demodIdteck(void) {
+    return CmdIdteckDemod("");
+}
+
+
 // by marshmellow
 // takes 3 arguments - clock, invert, maxErr as integers
 // attempts to demodulate nrz only