Add break/continue support to for/foreach loops and fix whileuntil EscapeMode handling

[Copilot]

ControlsFor and ControlsForEach did not support break/continue statements. ControlsWhileUntil failed to reset EscapeMode after break, corrupting outer loop execution, and lacked break/continue support in UNTIL mode.

Changes

ControlsFor.cs & ControlsForEach.cs

• Added break/continue handling after statement evaluation
• Reset EscapeMode to None after processing flow control
• For loops properly increment counter before continue

ControlsWhileUntil.cs

• Moved break check from before to after statement execution
• Added continue support for WHILE mode
• Added break/continue support for UNTIL mode (was missing)
• Both modes now reset EscapeMode to prevent outer loop corruption

Pattern follows existing ControlsRepeatExt.cs implementation:

statement.Evaluate(context);

if (context.EscapeMode == EscapeMode.Break)
{
  context.EscapeMode = EscapeMode.None;
  break;
}

if (context.EscapeMode == EscapeMode.Continue)
{
  context.EscapeMode = EscapeMode.None;
  continue;
}

Testing

Added 8 tests covering break/continue in for, foreach, while, until loops, plus nested loop isolation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Various issues with break and continue</issue_title> <issue_description>* for and foreach do not support break and continue at all - could be helpful to support these

• whileuntil does not reset the EscapeMode after Break which may corrupt execution of outer loops</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes richorama/IronBlock#66

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