ime_dialog: Initial implementation (#1267)

* Add C string types

* Prepare existing enums

* Added missing enums

* Types update

* State base

* Compile Ime Dialog UI

* UI implementation

* Scoped lock

* Functional implementation

* Link against iconv on macOS

* Fix building on windows

* Better UI

* clang-format

* Some fixes and cleanup

* Enable reserved checks

* clang-format

* Fix default text encoding max size

* clang-format (again)

* Some review changes

* Use std::vector for dynamic strings

* Use CString

* Accept dialog on enter press

* clang-format

* Use ImGUI for encoding/decoding

src/common/cstring.h

@@ -81,34 +81,42 @@ public:
         return std::basic_string_view<T>{data};
     }
 
-    char* begin() {
+    T* begin() {
         if (this == nullptr) {
             return nullptr;
         }
         return data;
     }
 
-    const char* begin() const {
+    const T* begin() const {
         if (this == nullptr) {
             return nullptr;
         }
         return data;
     }
 
-    char* end() {
+    T* end() {
         if (this == nullptr) {
             return nullptr;
         }
         return data + N;
     }
 
-    const char* end() const {
+    const T* end() const {
         if (this == nullptr) {
             return nullptr;
         }
         return data + N;
     }
 
+    constexpr std::size_t capacity() const {
+        return N;
+    }
+
+    std::size_t size() const {
+        return std::char_traits<T>::length(data);
+    }
+
     T& operator[](size_t idx) {
         return data[idx];
     }
@@ -152,6 +160,12 @@ public:
 static_assert(sizeof(CString<13>) == sizeof(char[13])); // Ensure size still matches a simple array
 static_assert(std::weakly_incrementable<CString<13>::Iterator>);
 
+template <size_t N>
+using CWString = CString<N, wchar_t>;
+
+template <size_t N>
+using CU16String = CString<N, char16_t>;
+
 #pragma clang diagnostic pop
 
 } // namespace Common