Modernize C# patterns and optimize method calls

[Copilot]

Refactors codebase to use modern C# patterns and eliminates redundant operations.

Property Conversions

• Language & Update classes: Converted 60+ public fields to properties for proper encapsulation
• ProcessLocker: Replaced getter/setter methods (GetFileName(), GetFilePath()) with read-only properties
• LanguageManager: Changed from private field + getter to auto-property

// Before
public string Author;
Language l = LanguageManager.GetLanguage();

// After  
public string Author { get; set; }
Language l = LanguageManager.CurrentLanguage;

Modern C# Patterns

• Switch expressions in LanguageManager.LoadLanguage()
• Using declarations (C# 8.0) to reduce nesting
• String interpolation over concatenation
• Object initializers for struct construction

Performance Optimizations

• ProcessLocker constructor: Eliminated duplicate GetMainModuleFilepath() call
• SetOwnership: Cached GetPath() and File.GetAttributes() results (5+ redundant calls removed)

Code Quality

• Fixed null-conditional operator pattern in RegManager (?.ToString() == string.Empty → string.IsNullOrEmpty())
• Fixed typo in XML docs: "wether" → "whether"
• Added application name constant

Net impact: -35 lines, 10 files modified

Original prompt

Suggest code improvements

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