Add Localization.cpp/h (not compiled yet)

This commit is part of rewritten history of the localization branch.
The original (unsquashed) commit history can be found here:
https://github.com/Dav999-v/VVVVVV/tree/localization-orig

desktop_version/src/Localization.h

@@ -0,0 +1,93 @@
+#ifndef LOCALIZATION_H
+#define LOCALIZATION_H
+
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+/* The translator menu will appear in any of the following circumstances:
+ * - The "lang" folder is NOT next to data.zip, but it is found in "desktop_version" within which the game is running
+ * - The command line argument "-translator" is passed
+ * - ALWAYS_SHOW_TRANSLATOR_MENU is defined
+ */
+// #define ALWAYS_SHOW_TRANSLATOR_MENU
+
+namespace loc
+{
+
+struct LangMeta
+{
+    bool active; // = true, language is shown in the list
+    std::string code;
+    std::string nativename;
+    std::string credit;
+    std::string action_hint;
+    bool autowordwrap; // = true; enable automatic wordwrapping
+    bool toupper; // = true; enable automatic full-caps for menu options
+    bool toupper_i_dot; // = false; enable Turkish i mapping when uppercasing
+    bool toupper_lower_escape_char; // = false; enable ~ to mark lowercase letters for uppercasing
+    std::string menu_select;
+    std::string menu_select_tight;
+    unsigned char font_w;
+    unsigned char font_h;
+};
+
+struct TextboxFormat
+{
+    const char* text;
+    unsigned short wraplimit; // = 36*8-pad_left-pad_right; no effect if tt or !langmeta.autowordwrap
+    unsigned short wraplimit_raw; // original value of wraplimit, only used for language file sync
+    bool tt; // teletype, don't auto-wordwrap
+    bool centertext; // whether the text should be centered inside the box
+    unsigned char pad_left; // pad with X characters
+    unsigned char pad_right;
+    unsigned short padtowidth; // pad to X pixels (0 to disable)
+};
+
+extern bool lang_set;
+extern std::string lang;
+extern std::string lang_custom;
+extern LangMeta langmeta;
+extern std::vector<LangMeta> languagelist;
+extern int languagelist_curlang;
+extern bool show_translator_menu;
+extern size_t limitscheck_current_overflow;
+
+extern int n_untranslated_roomnames;
+extern int n_unexplained_roomnames;
+extern int n_untranslated_roomnames_custom;
+extern int n_unexplained_roomnames_custom;
+
+enum n_untranslated_index
+{
+    UNTRANSLATED_STRINGS = 0,
+    UNTRANSLATED_NUMBERS,
+    UNTRANSLATED_STRINGS_PLURAL,
+    UNTRANSLATED_CUTSCENES,
+    UNTRANSLATED_ROOMNAMES_SPECIAL,
+    COUNT_UNTRANSLATED_INDEX
+};
+extern int n_untranslated[COUNT_UNTRANSLATED_INDEX];
+
+
+const LangMeta* get_langmeta(void);
+
+const char* gettext(const char* eng);
+const char* gettext_plural(const char* eng_plural, const char* eng_singular, int count);
+void gettext_plural_fill(char* buf, size_t buf_len, const char* eng_plural, const char* eng_singular, const char* args_index, ...);
+std::string getnumber(int n);
+const TextboxFormat* gettext_cutscene(const std::string& script_id, const std::string& eng, char textcase);
+const char* get_roomname_explanation(bool custom_level, int roomx, int roomy);
+const char* get_roomname_translation(bool custom_level, int roomx, int roomy);
+const char* gettext_roomname(bool custom_level, int roomx, int roomy, const char* eng, bool special);
+const char* gettext_roomname_special(const char* eng);
+
+bool is_cutscene_translated(const std::string& script_id);
+
+uint32_t toupper_ch(uint32_t ch);
+std::string toupper(const std::string& lower);
+std::string remove_toupper_escape_chars(const std::string& _s);
+
+} /* namespace loc */
+
+#endif /* LOCALIZATION_H */