Added at_computer and at_planet prompt detection

  We can now detect with a simple check if we are at command computer or
plent prompts quickly.

utils.cpp

@@ -145,6 +145,18 @@ bool at_command_prompt(const std::string &prompt) {
   return false;
 }
 
+bool at_computer_prompt(const std::string &prompt) {
+  if (startswith(prompt, "Computer command ["))
+    if (endswith(prompt, "] (?=Help)? ")) return true;
+  return false;
+}
+
+bool at_planet_prompt(const std::string &prompt) {
+  if(startswith(prompt, "Planet command (?=Help)"))
+    if (endswith(prompt, " [D] ")) return true;
+  return false;
+}
+
 #include <algorithm>
 #include <cctype>
 

utils.h

@@ -23,6 +23,8 @@ std::string repr(const std::string &source);
 
 bool file_exists(const std::string &name);
 bool at_command_prompt(const std::string &prompt);
+bool at_computer_prompt(const std::string &prompt);
+bool at_planet_prompt(const std::string &prompt);
 void str_toupper(std::string &text);
 void str_tolower(std::string &text);