Add cppcheck analysis shims and configure Codacy include paths

[NathanNeurotic]

Motivation

• Silence Codacy/cppcheck missing-include warnings by supplying analysis-only headers and include paths so static analysis can see PS2SDK symbols.
• Provide lightweight, non-functional typedefs/macros for PS2SDK and OSD APIs to avoid inventing runtime behavior.
• Keep runtime behavior unchanged by gating all shims behind __CPPCHECK__ so normal builds use real SDK headers.

Description

• Added include/cppcheck_shims.h which pulls in ps2sdk_shim.h and defines minimal typedefs, constants and stub OSD accessor functions used only for analysis.
• Updated .codacy.yml to pass explicit cppcheck arguments and include paths (-Iinclude, -Itools/codacy_shims/ps2sdk, -Itools/codacy_shims/stdlib) so Codacy can use the repo shims during analysis.
• Wrapped PS2SDK and other nonstandard includes with #ifdef __CPPCHECK__ to include the analysis shim instead of system headers in many headers and source files (examples: include/main.h, include/debugprintf.h, include/psx/plibcdvd_add.h, and multiple src/*.c files).
• Changes are analysis-only (shims are compiled only when __CPPCHECK__ is defined) and do not alter runtime behavior or the public API.

Testing

• No automated tests were executed as part of this change.
• Static analysis can be exercised locally or in CI using the existing scripts/cppcheck.sh which now picks up the shim include paths.

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Codex Task

[codacy-production]

Codacy's Analysis Summary

0 new issue (≤ 0 issue)
0 new security issue
5 complexity
0 duplications

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