Python Support (wip)

[UnidayStudio]

Hi! Thanks for the text editor, I appreciated it and I'm using in my game engine that works by embedding python.

I had to write some code in order to support this language (Python) so I decided to share it here to contribute somehow.

The code is not complete and unfortunatelly I don't know regex to properly do the mTokenRegexStrings part so I just copied this snippet from the HLSL code. That's why I'm opening an issue instead of a formal contribution (pr on the dev branch).

Again, thank you for the editor!

        static LanguageDefinition langDef;

        static const char* const keywords[] = {
            "False", "None", "True", "and", "as", "assert", "break", "class", 
            "continue", "def", "del", "elif", "else", "except", "finally", 
            "for", "from", "global", "if", "import", "in", "is", "lambda", 
            "nonlocal", "not", "or", "pass", "raise", "return", "try", "while", 
            "with", "yield",
            "__class__", "__delattr__", "__dict__", "__dir__", "__doc__", "__eq__", 
            "__format__", "__ge__", "__getattribute__", "__gt__", "__hash__", 
            "__init__", "__le__", "__lt__", "__module__", "__ne__", "__new__", 
            "__reduce__", "__reduce_ex__", "__repr__", "__setattr__", "__sizeof__", 
            "__str__", "__subclasshook__", "__weakref__"
        };

        for (auto& k : keywords) langDef.mKeywords.insert(k);

        static const char* const identifiers[]{
            "abs", "delattr", "hash", "memoryview", "set", "all", "dict", "help", 
            "min", "setattr", "any", "dir", "hex", "next", "slice", "ascii", "divmod", 
            "id", "object", "sorted", "bin", "enumerate", "input", "oct",
            "staticmethod", "bool", "eval", "int", "open", "str", "breakpoint", 
            "exec", "isinstance", "ord", "sum", "bytearray", "filter", "issubclass", 
            "pow", "super", "bytes", "float", "iter", "print", "tuple", "callable", 
            "format", "len", "property", "type", "chr", "frozenset", "list", "range",
            "vars", "classmethod", "getattr", "locals", "repr", "zip", "compile", 
            "globals", "map", "reversed", "__import__", "complex", "hasattr", "max", 
            "round"
        };

        for (auto& k : identifiers) {
            Identifier id;
            id.mDeclaration = "Built-in function";
            langDef.mIdentifiers.insert(std::make_pair(std::string(k), id));
        }

        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("[ \\t]*#[ \\t]*[a-zA-Z_]+", PaletteIndex::Preprocessor));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("L?\\\"(\\\\.|[^\\\"])*\\\"", PaletteIndex::String));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("\\'\\\\?[^\\']\\'", PaletteIndex::CharLiteral));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("[+-]?([0-9]+([.][0-9]*)?|[.][0-9]+)([eE][+-]?[0-9]+)?[fF]?", PaletteIndex::Number));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("[+-]?[0-9]+[Uu]?[lL]?[lL]?", PaletteIndex::Number));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("0[0-7]+[Uu]?[lL]?[lL]?", PaletteIndex::Number));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("0[xX][0-9a-fA-F]+[uU]?[lL]?[lL]?", PaletteIndex::Number));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("[a-zA-Z_][a-zA-Z0-9_]*", PaletteIndex::Identifier));
        langDef.mTokenRegexStrings.push_back(std::make_pair<std::string, PaletteIndex>("[\\[\\]\\{\\}\\!\\%\\^\\&\\*\\(\\)\\-\\+\\=\\~\\|\\<\\>\\?\\/\\;\\,\\.]", PaletteIndex::Punctuation));

        langDef.mCommentStart = R"(""")";
        langDef.mCommentEnd = R"(""")";
        langDef.mSingleLineComment = "#";

        langDef.mCaseSensitive = true;
        langDef.mAutoIndentation = true;

        langDef.mName = "Python";