refactor: Humongous Commit

Major architectural refactorbto focus exclusively on JIT development.

JIT & Decoder Architecture
-    Implemented scripts/generate_jit_decoder_a32_table.py to parse
     instruction definitions at build-time rather than runtime.
-    Moves decoder lookup tables from RAM to ROM.

Scope Reduction:
-    Removed frontend, GUI, and rendering dependencies.
-    delete src/frontend, src/target, and associated design docs.

Most importantly, this commit starts the transition of this codebase
from C++ to C. I cant stand creating C++ code, and since no one else
is contributing to this project this change shouldnt matter.

Signed-off-by: Ronald Caesar <github43132@proton.me>

3rd_Party/CMakeLists.txt

@@ -5,31 +5,6 @@ set_directory_properties(PROPERTIES EXCLUDE_FROM_ALL ON SYSTEM ON)
 # Set CMP0069 policy to "NEW" for building external targets with LTO enabled
 set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)
 
-# SDL3
-#if (NOT TARGET SDL3::SDL3)
-#  set(SDL_DISKAUDIO OFF)
-#   set(SDL_TEST_LIBRARY OFF)
-#  set(SDL_PIPEWIRE OFF)
-#  add_subdirectory(SDL3)
-#endif()
-
-# ImGui
-#set(IMGUI_SRC
-#    imgui/imgui.cpp
-#    imgui/imgui_demo.cpp
-#    imgui/imgui_draw.cpp
-#   imgui/imgui_tables.cpp
-#    imgui/imgui_widgets.cpp
-#    imgui/backends/imgui_impl_sdl3.cpp
-#    imgui/backends/imgui_impl_opengl3.cpp
-#)
-#add_library(imgui STATIC ${IMGUI_SRC})
-#target_link_libraries(imgui PRIVATE SDL3::SDL3)
-#target_include_directories(imgui PUBLIC
-#    imgui
-#   imgui/backends
-#)
-
 # GoogleTest
 add_subdirectory(googletest)
 enable_testing()

3rd_Party/PINNED_DEPENDENCIES.md

@@ -10,28 +10,6 @@ This document tracks all pinned third-party submodules in the Pound project. Eac
 3. Update this document with the new commit hash
 4. Be committed as a separate, clear change
 
-### ImGui
-- **Repository**: https://github.com/ocornut/imgui.git
-- **Version Tag**: v1.92.3
-- **Pinned Commit**: bf75bfec48fc00f532af8926130b70c0e26eb099:
-- **License**: MIT
-- **Purpose**: Provides the graphical user interface for Pound.
-- **Pinning Date**: 2025-09-20
-- **Pinning Reason**: Provides the UI functionality we need with no known security issues
-- **Last Review**: 2025-09-20
-- **Next Review**: 2026-03-20
-
-### SDL3
-- **Repository**: https://github.com/libsdl-org/SDL
-- **Version Tag**: v3.2.22
-- **Commit Hash**: a96677bdf6b4acb84af4ec294e5f60a4e8cbbe03
-- **License**: Zlib
-- **Purpose**: Provides the backend renderer for ImGui.
-- **Pinning Date**: 2025-09-20
-- **Pinning Reason**: Provides the UI render backend functionality we need with no known security issues
-- **Last Review**: 2025-09-20
-- **Next Review**: 2026-03-20
-
 ### GoogleTest
 - **Repository**: https://github.com/google/googletest
 - **Version Tag**: v1.17.0

3rd_Party/SDL3

@@ -1 +0,0 @@
-Subproject commit a96677bdf6b4acb84af4ec294e5f60a4e8cbbe03

3rd_Party/imgui

@@ -1 +0,0 @@
-Subproject commit bf75bfec48fc00f532af8926130b70c0e26eb099