Add support for MetaTrader .mq4 and .mq5 files (MQL syntax, similar to C++)

[adat2029]

Hello,

First of all, thank you for developing this excellent extension! 🚀

I would like to request native support for MetaTrader source code files (.mq4 and .mq5).

Context:

• Language: MQL4 and MQL5 (proprietary languages for algorithmic trading on the MetaTrader platform, see mql5.com).
• Syntax: The syntax is almost identical to C++.
• Current Behavior: These files are not recognized by default and require manual configuration with specific UTI/MIME mapping to work properly.

Technical Details:
On macOS, the system identifies these files with the following MIME type (identical to C source):

$ file --mime-type example.mq4
example.mq4: text/x-c
$ file --mime-type example.mq5
example.mq5: text/x-c++

Request:
Could you please add .mq4 and .mq5 extensions to the default C/C++ syntax highlighting group? This would greatly help the algorithmic trading community on macOS.

Thank you!

mq4
dyn.ah62d4rv4ge8046my
dyn.age8046my

mq5
dyn.ah62d4rv4ge8046mz
dyn.age8046mz