Add parameter parsing with cmd-style quoting and action validation

[svtica]

Summary

This PR introduces a new ParameterParser module to handle command-line parameter parsing with support for cmd-style quoting, refactors SettingsValidator to validate individual task actions, and integrates validation into the UI forms. A new MSTest project provides comprehensive test coverage for the parameter parser.

Key Changes

• New ParameterParser module (Class/ParameterParser.vb):

  • Parses key=value parameter strings with support for quoted values containing spaces: key="value with spaces"
  • Maintains backward compatibility with the original whitespace-delimited unquoted form
  • Skips malformed tokens (missing = or empty keys) and handles duplicate keys (last write wins)
  • Tolerates leading/trailing whitespace

• Enhanced SettingsValidator (Class/SettingsValidator.vb):

  • Added ValidateTaskAction(action[, siblingActions]) method to validate individual task actions
  • Validates: name/target presence, target file existence (for PowerShell/Batch/Executable types), timeout >= 1 minute, non-negative retry parameters, and DependsOn references to sibling actions
  • Prevents self-referential dependencies and validates cross-action consistency

• Updated TaskRunner.ParseParameters (Class/TaskRunner.vb):

  • Delegates to the new ParameterParser.Parse() instead of inline string splitting
  • Enables cmd-style quoting support while maintaining backward compatibility

• Form validation integration:

  • ActionDialog.ValidateInput() now uses SettingsValidator.ValidateTaskAction() for consistent validation rules
  • TaskForm.OkButton_Click() calls new ValidateTaskActions() to validate all actions before saving, checking cross-action DependsOn consistency

• New test project (Tests/LiteTask.Tests.vbproj):

  • MSTest-based unit tests for ParameterParser covering 11 scenarios: basic parsing, quoted values with spaces, mixed quoting, empty values, malformed tokens, duplicate keys, and whitespace tolerance

• Documentation:

  • Added CHANGELOG.md documenting all changes
  • Added French translations for new validation messages in LiteTaskData/lang/fr.xml
  • Updated solution and project files to include the new test project

Implementation Details

• Parameter parsing uses a character-by-character state machine approach to handle quoted and unquoted values correctly
• Validation is centralized in SettingsValidator so UI and persisted-task validation share the same rule set
• The DependsOn validation checks sibling actions by name (case-insensitive) to prevent circular or missing dependencies