Release Notes for Cppcheck 2.14

New checks:
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Improved checking:
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GUI:
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Changed interface:
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Deprecations:
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Other:
- Added CMake option 'EXTERNALS_AS_SYSTEM' to treat external includes as 'SYSTEM' ones.
- The minimum required compiler versions have been bumped to GCC 5.1 / Clang 3.5 / Visual Studio 2015
- The minimum required CMake version has been bumped to 3.5