game/debugging: Add a new imgui menu to filter debug text and adjust imgui config settings (#2085)

This adds a new ImGUI menu to help filter out the clutter on screen.


https://user-images.githubusercontent.com/13153231/210192912-b1c28319-bacb-449c-ad7f-e7308fb75f50.mp4

This also:
- moves the imgui display bool into a game specific config file (you can
hide it in jak1, and not in jak2)
- the config file also persists the settings from this menu (except the
filters for now, future TODO)
- there is a new `ignore_imgui_hide_keybind` in this file to ignore
hiding it when you press Alt

common/util/StringUtil.cpp

@@ -1,9 +1,15 @@
 #include "StringUtil.h"
 
+#include <regex>
+
 namespace str_util {
 
 const std::string WHITESPACE = " \n\r\t\f\v";
 
+bool contains(const std::string& s, const std::string& substr) {
+  return s.find(substr) != std::string::npos;
+}
+
 bool starts_with(const std::string& s, const std::string& prefix) {
   return s.rfind(prefix) == 0;
 }
@@ -31,4 +37,14 @@ int line_count(const std::string& str) {
   }
   return result;
 }
+
+// NOTE - this won't work running within gk.exe!
+bool valid_regex(const std::string& regex) {
+  try {
+    std::regex re(regex);
+  } catch (const std::regex_error& e) {
+    return false;
+  }
+  return true;
+}
 }  // namespace str_util