GC Behaviour update and quality of life changes

[0xF6]

Summary by CodeRabbit

Given the extensive nature of the provided changes, the existing bullet-point list remains valid and adequately summarizes the modifications. Therefore, it is repeated verbatim below:

• Refactor

  • Renamed core classes and methods to improve clarity and consistency across the codebase.
  • Enhanced memory management with the introduction of smart pointers and allocator pools.
  • Implemented IDisposable interface in several classes to ensure proper resource disposal.

• New Features

  • Introduced conditional property groups for platform-specific constants.
  • Added new memory allocation tracking and debugging features.
  • Implemented new methods for memory allocation and deallocation.

• Bug Fixes

  • Fixed potential index out-of-range issues by adjusting comparison operators.
  • Corrected method calls and assertions in test cases to align with updated return value structures.

• Tests

  • Expanded test coverage with new test methods for object population and memory allocation.
  • Updated test base to handle disposable objects and virtual machine shutdown more effectively.

• Documentation

  • No specific documentation changes noted in the summary provided.

• Chores

  • Adjusted project files for different build configurations, optimizing for release and debugging for development.

• Style

  • No specific style changes noted in the summary provided.

• Revert

  • No reverts indicated in the summary provided.

[coderabbitai[bot]]

## Walkthrough
The changes across the system primarily involve renaming the `VM` class to `VirtualMachine` and updating associated references. Memory management has been enhanced with the introduction of `SmartPointer` for safer pointer operations and a new allocator pool for efficient memory allocation. Conditional compilation has been used to define constants for different operating systems. The test suite has been updated to reflect these changes, and new tests have been added to ensure the robustness of memory-related functionalities.

## Changes

| File(s) | Summary |
| --- | --- |
| `Directory.Build.props` | Added conditional OS-specific constants and updated `DefineConstants`. |
| `runtime/.../DefaultWatchDog.cs`, `runtime/.../ForeignFunctionInterface.cs`, `runtime/.../IshtarCore.cs`, `runtime/.../NativeExports.cs`, `runtime/.../Program.cs`, `runtime/.../AppVault.cs`, `runtime/.../ModuleReader.cs`, `runtime/.../IshtarFrames.cs`, `runtime/.../VirtualMachine.cs`, `runtime/.../vm.shit.cs`, `runtime/.../vm.switch.cs`, `test/.../IshtarTestBase.cs` | Renamed `VM` to `VirtualMachine` and updated references. |
| `runtime/.../SmartPointer.cs`, `runtime/.../CallFrame.cs`, `runtime/.../stackval.cs` | Introduced `SmartPointer` struct for memory management and updated usage. |
| `runtime/.../IshtarGC.cs`, `runtime/.../IshtarObject.cs`, `runtime/.../RuntimeIshtarClass.cs`, `runtime/.../RuntimeIshtarField.cs`, `runtime/.../allocators/IIshtarAllocatorPool.cs` | Enhanced memory management with new data structures, allocator pool, and debug info. |
| `test/.../ArrayTest.cs`, `test/.../GCTest.cs`, `test/.../InstructionSizeTest.cs`, `test/.../InstructionTest.cs`, `test/.../MethodExecuteTest.cs` | Updated tests to use array indexing for `returnValue` and added new memory management tests. |
| `runtime/.../IshtarArray.cs`, `runtime/.../__builtin/B_StringBuilder.cs`, `runtime/.../runtime/IshtarGC.cs` | Modified memory allocation methods and assertions. |
| `runtime/.../FFI/GCFlags.cs`, `runtime/common/reflection/VeinTypeCode.cs` | Added new enum values and specified underlying type for `VeinTypeCode`. |
| `runtime/.../ishtar.vm.csproj`, `test/.../ishtar_test.csproj` | Updated project files for build configurations. |
| `test/.../NegativeCases.cs` | Modified test to handle unsafe pointer operations and exception assertions. |

> 🐇 In the fall, where leaves descend,  
> Our code now safer, bugs to mend.  
> With `SmartPointer` and `VirtualMachine`,  
> Memory dances, clean and pristine. 🍂🧹

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[0xF6]

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