[Feature request] model.cfg checks

[ilbinek]

Add basic checks for model.cfg

These should include:

• checks for missing semicolons
• brackets checks
• basic inheritance checks

class MainTurretT: MainTurret {  // check `MainTurret` is defined
    source = "mainTurretT_source"; // Check semicolon present
}; // Check closing bracket and semicolon present