Fix merge conflicts from develop sync: Vector2 Scale and rendering features

[Copilot]

Checklist

• I have added a changelog entry to the CHANGELOG.md file on the branch/fork (if it is an internal change, this is not needed).
• This pull request meets the Coding Conventions standards: https://github.com/MontyTRC89/TombEngine/blob/master/CONTRIBUTING.md#coding-conventions

Links to issue(s) this pull request concerns (if applicable)

N/A

Pull request description

Merge with develop introduced breaking changes to renderer string API. The original PR changed Scale from float to Vector2 but merge left inconsistent types causing C2446/C2440 errors.

Core Type Changes

• RendererStringToDraw: Scale changed from float to Vector2; added Rotation, Priority, Blend, HasScissor, ScissorRect
• RendererString.cpp: All scale math now uses Vector2 (stringScale.y for scalar operations, full Vector2 for DrawString)
• DrawString calls: Updated to accept Vector2 scale and float rotation parameters

Feature Additions

• Priority-based rendering: Strings now sorted by priority before draw
• Per-string blend modes: Each string can specify blend mode; SpriteBatch restarted on mode change
• Scissor rectangle support: Per-string clipping regions with state tracking
  • Added HasActiveDisplayScissor() / GetActiveDisplayScissor() to DisplaySprite
  • Applied to both RendererStringToDraw and RendererDisplaySpriteToDraw

API Changes

// New string methods
void AddString(const std::string& string, const Vector2& pos, const Vector2& prevPos, 
               const Vector2& area, const Color& color, const Vector2& scale, 
               float rotation, int flags, int priority, BlendMode blendMode);

Vector2 GetDisplayStringSize(const std::string& text, const Vector2& scale = Vector2::One) const;

// Scissor API (DisplaySprite namespace)
void SetActiveDisplayScissor(const RendererRectangle& rect);
bool HasActiveDisplayScissor();

Implementation Notes

• DrawAllStrings() now manages blend state and scissor state per string with SpriteBatch restart on change
• Internal AddStringInternal() handles both float and Vector2 scale overloads
• SpriteBatch::Begin() signature updated to include rasterizer state parameter